Heres the real advice; why not flirt with him when you are talking to him? If you say, for example, that you want to hang out with him or something along those lines, whats the worst that can happen? He might say no., so what? You can find another guy, its not like you are in LOVE with him, just get to know him. In reality, your brain makes it seem x10 worse than it really is. So why not make him a nice comment or something flirty to drop him a hint?