She has a boyfriend but keeps looking and smiling at me, what's the meaning of this?

Anonymous
There is this one girl I just can't get out of my head. She is really attractive and has an awesome, easy-going personality.
I already know her a little bit since she lives in the same house as I. One thing I've noticed, it feels quite familiar talking to her and she is always very enthusiastic and open towards me.

Anyway, some days ago we met at a party and we talked some time sitting side by side. We teased each other and I threw in some compliments from time to time. She was almost constantly touching her hair in a playful way when she talked to me, which is a good sign I guess (or so I've heard). At this point I already knew she had a boyfriend. I may sound like a jerk saying this but since I don't know this guy I couldn't care less. They have been together for 6 months now which isn't that long anyway. It's just, at times there is a girl who gives you the feeling she might be THE one.

After the party some of us (including me and her) went to a pub. The problem was that her boyfriend came as well, he wasn't at the party before.
So we sat at a table whereas her boyfriend talked to her female roommate and some other guys, and I talked to my friends. Funniest thing I noticed, I caught her looking and smiling at me several times while she was sitting beside her boyfriend.

This is just incredibly confusing. Is she playing games with me or could it be that she is weighing her options and thinking about me as her potential boyfriend.
She has a boyfriend but keeps looking and smiling at me, what's the meaning of this?
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