There are many subtle things a guy can do that you would need to read... and when you're hoping he likes you, you will usually find body language to support the idea that he does. The most fool proof way is to test the waters. Find a seemingly innocent reason for talking to him and get to know him a little better. Then don't be afraid to come right out and say that you're going to a (movie, sports game, something) that you know he's interested in and you thought he might like to go. If he goes, yeah, he probably is. If he makes an excuse, drop it and find somebody else before you turn into a lovesick stalker! Is he breathing? The better question is what are his goals.