is he gay? help

i dont have much time so im gonna make this pretty short.I becames friedns with this guy when we started sitting together in class. i started too develop a crush on him. One day he leaned over and asked if i was gay. i was really shocked so i said no. Sometimes i see him staring at me, and he even blew me a kiss once. I know some straight guys like to joke around. He sometimes touches and pokes me in the side and stomach. I dont know if he does this to other people but hes a really funny guy who jokes but hes really nice to everyone. What do you think? thanks