Alexa on FanForum(go check out the SK thread there btw link)
worked hard on this list&i thought i'd share it on here since i love all the reasons: some are sweet, some are hilarious&some are just plain awesome


01. Because we are intrigued by them
02. Because he wanted to save her too!
03. Because Katherine loved Stefan best.
04. Because she told him she loved him as he died.
05. Because she had him take her to the founders ball.
06. Because he told her he would love her forever.
07. Because he could bring out the humanity in her.
08. Because she changed him.
09. Because he lost his virginity to her.
10. Because he kept the photo of her.
11. Because he loved her laugh.
12. Because he thought she was the most beautiful girl he's ever known.
13. Because she wanted him to chase her.
14. Because she thinks he plays rougher.
15. Because "You and Katherine were the perfect couple."
16. Because she came back for him.
17. Because he'll never forget her!
18. Because, "don't kid yourself, Stefan is just as in love with Katherine as Damon was, if not more. "
19. Because she was his Creator. she was his lover. He thought she was his soulmate.
20. Because 'when she comes back, I think it's going to knock the hell out of him."
21. Because she thinks hes sexy.
22. Because "I came back for you."
23. Because "that sounds like the beginning of a love story, not the end."
24. Because she can bring out the evil in him. ;)
25. Because he followed her outside!
26. Because we think he doth protest too much!
27. Because their eye sex in 2x01 was outstanding.
28. Because he knew it was her immediately.
29. Because "The truth is... It was always S t e f a n."
30. Because even when they fight, its hot.
31. Because their hug was "just what i needed" -katherine
32. Because with them, there are no rules.
33. Because she wants to play with him.
34. Because "How about we don't have a couples fight in front of all your friends."
35. Because she thinks he' s "stronger, meaner, sexy."
36. Because he knew it was her in an instant.
37. because shes got him smiling!
38. because "i know the truth. and deep down so do you."
39. because hate is safer than love.
40. because "you're hurting my feelings stefans."
41. because "then again he thought i was your girlfriend."
42. because "walk with me?"
43. because "maybe i missed you."
44. because "dont you remember?"
45. because what am i gonna do when the best part of me was always you?
46. because they were totally flirting!
47. because "i havent spent the last 145 years obsessed with you." "yeah? based on your choice of women, i'd say otherwise."
48. because "it does bother me that you're falling in love with someone else."
49. because she looked hurt when he said he didnt love her.
50. because she got into his head to show how much it hurts.
51. because "dont fight it stefan. you loved me once. you can love me again."
52. because "i love you stefan. we will be together again. i promise."
53. because they looked so adorable on that bed together!
54. because "you have to admit, i am getting better at this."
55. because their fighting is fun.
56. because "i wanted to see you. i missed you, stefan."
57. because "indulge me for a little while, please?"
58. because shes back in town for 3 reasons. stefan, stefan, and stefan.
59. because "deep down inside that gorgeous body of yours is the stefan that fell in love with me too. "
60. because "it was just too tempting. all of your inner thoughts and feelings."
61. because yes stefan, why DID you keep her picture?
62. because "you wanna know why i came back?... why did you?"
63. because he came back for her too!
64. because "you came back here to fall in love with me all over again, didnt you." no response stefan? we'll take that as a yes!
65. because "what is it about you that makes me still care?"
66. because they kissed. and it was hawt!
67. because everytime, her answer is that she came back for him.
68. because "does she know that you love me?"
69. because "dont you remember?" WE DO!
70. because "so i gather i'm wanted?" "vey much so."
71. because dont worry stefan, you arent in competition for her affections!
72. because "i've never met a woman quite like you."
73. because "i look at you and i see an angel."
74. because "i touch your skin and my entire body ignites."
75. because "i kiss you and i know that i am falling in love."
76. because katherine was completely touched/moved by his words.
77. because "i am in love with you."
78. because "more to learn and love."
79. because she wanted to protect him.
80. because he surprised her.
81. because "until tomorrow."
82. because she touched her mouth after they kissed.
83. because "torture me, keep me captive, drain me of my blood until it turns to dust. it'll never change the truth."
84. because she never compelled him to love her.
85. because "i never compelled your love. it was real, and so was mine."
86. because he died for her. he died for love.
87. because "hearing the truth after a century and a half of denial must be overwhelming."
88. because "you were so scared of me. i had to take away your fear."
89. because "love. hate. such a fine line."
90. because "i can wait."
91. because he couldnt kill her.
92. because she really did come back for him.
93. because she made sure she could see him one last time.
94. because "i want what i want stefan. and i dont care what i have to do to get it."
95. because "i guess you dont hate me as much as you thought you did."
96. because she doesnt want him seeing elena anymore.
97. because "i missed you stefan. i just wanted to spend some time with you."
98. because she stabs him, then he stabs her. its how they roll.
99. because "katherine is used to getting her way."
100. because "she wants to get between us." "she already has, elena."
101. because "i know her."
102. because "katherine doesnt care about anyone but herself." PROVED YOU WRONG.
103. because what kind of heart doesn't look back
104. because the fire inside still burns
105. because he's the air I would kill to breathe
106. because I am left hoping someday I'll breathe again
107. because I only wanted love from you
108. because "send my love to Stefan."
---------------------------------------
Now we @ the vampdiaries.net forum sk thread link
thought since it was a list that we should just keep it ongoing&keep adding to it becuz you know sk love is neverending ^^
so here are more reasons we (credit for the reasons below go to: me, DE-stin-ED, <Julie>&Delena) all thought up:

109. because "forever is a very long time" "not long enough"
110. because whenever he says something hurtful you can see the pain flash across her face cutting her armour of steel
111. because they move around each other so naturally
112. because when he woke up to find her next to him&told her to go back to sleep that moment was filled with so much peace
113. because his love for her never died&when he quits being in denial about it the love will explode from his heart
114. because they are completely different around each other, one like fire the other like ice &when the two collide sparkage ensues
115. because they are two halves of the same whole&without each other cease to function properly
116. Because he didn't tell Elena about her. Why tell your girlfriend about the ex you're still in love with? Even if you won't admit it to yourself.
117. Because Katherine's in Memory Lane, Katherine's last flashback and the way she acted/looked while she was reminiscing were sweet and heart-touching beyond belief.
118. Because we totally felt bad for Kat, when we found out the break-up wasn't real.
119. Because he got her to put Bonnie down. Who else could do that?
120. Because in The Return, she looked hurt when he didn't take her hand.
121. Because why is it always "good girl/bad boy"? Let's mix it up!
122. Because Who doesn't look at a picture daily for over a century of someone "they're not in love with/they hate?"*cough*sarcasm*cough*
123. Because "you were watching Bon Jovi and I was watching you"
124. Because she mouthed "i love you" to stefan
125. Because in 2x04 she came back to kiss him
126. Because "we will be together again, I promise"
127. Because she was watching over him over the years and she never abandoned him as he had thought