I catch him looking at me and he brushed up against me?

Anonymous
There is a guy in my grad school program. We have talked once or twice and have a number of mutual friends. Before and after classes I catch him looking at me a lot, and one time when he walked behind me he brushed up against me very noticeably even though he had plenty of room to go around. We say "Hi" when we see each other and are friends on Facebook, but nothing beyond that. I'm not sure if he might be interested.

The catch is, before all this started I asked him if he wanted to go with me to a basketball game because I had an extra ticket (although it was very clear I wasn't asking him in a date-ish way, I was trying to get the extra ticket used) and he said no, and if he were interested, he probably wouldn't have said no. Then again, the eye contact thing didn't start until after that.

I am frequently told that I am attractive/interesting, but I am pathetically bad at flirting/dating. Help?
I catch him looking at me and he brushed up against me?
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