Locking eyes with this guy?

We lock eyes. He'll talk to his friend who sits next to me (I'm friends with him too) and when they talk he'll glance over at me, and we lock eyes. When we walk past each other in the hall we lock eyes. I was tying to see the teacher, and he turned around and sort of glared/smirked at me so I don't think he was seriously glaring. He was where I was trying to see. He also did this earlier that day.

He MAY have a girlfriend, my friend spreads a lot of rumors which are hardly ever true. I don't think he likes me, like even in a friendly manner. I feel like he finds me annoying. I don't know him very well, a long time ago I asked him about some bands. But that was over Facebook. I'm not going to lie, I do think he's cute, and would like to get to know him better. But I'm awkward around guys I think are cute, so I don't know how to approach him. Tips on that would be spectacular.

So, what's going on otherwise? Why do we lock eyes?