I know you all are probably sick of questions like this, but do you think this guy is gay?

I think you should just hang out with him like after classes and such. Go to the movies with him(just the two of you) and just start hanging out with him a lot. You should say gay remarks too and see how he reacts to them. And if you are really close to him play the nervous game(where you start at the knee and work your way up to the private parts asking "are you nervous" each time you move closer) lol. Overall just try and get closer to him as possible, share secrets with eachother haha:).