Advice on a crush?

I've honestly felt similar to the way you're feeling right now! I'm not the best at giving out advice, but I'd say just be yourself around him. I know that you're really wanting to know if he likes you (believe me, I'm like that with my crushes too when my friends tell me that they like me) but I messed up one time and ruined everything so I'd just wait until the time comes when you're for sure about it.
And you really shouldn't be so negative about it. Even though it's a 50/50 chance, just be yourself around him even so. :) It really sucks having crushes on your friends (I know from experience) because they either like you back or they just like you as a friend... But either way it could happen.

(Sorry I'm rambling).
Anyway, what I think you should do (which I probably mentioned before) is just be yourself. Even though it's hard to act like you 'don't like him' you should anyway. And if the majority of people are saying he likes you, then it probably is true.
All in all, just be yourself. I'm sure that things will turn out right, no matter what. :) Good luck!