Hello all,

I know this girl at college that I see everyday since we're in the same program and I consistently get ioi's such as she will twirl/play with her hair when I talk to her, and in general there's tension like when we were sharing a computer at school our faces were only inches apart and she didn't pull away or anything. Now I know she has a BF since she told a friend of mine but she has never directly brought him up to me at all.
So Saturday night rolls around and I decide to text her.
After some back and forth texting:

Me: (clubname) it is. If you're not studying come out I may need a bodyguard (she's very petite)
Hb: Too bad for you, I'm studying. Just kick and pull hair, that should do the trick :p
Me: That confirms it..Stage 3 nerd alert :p. C ya Monday
Hb: Haha enjoy the clubs for me. See you Monday

Now I doubt she was actually studying close to midnight on Saturday but she also doesn't want to say what she's actually doing. I've known her about a month now and she never mentioned her bf to me. She'll text asking questions about school that I know she knows the answers to as she's very keen. She'll also text on a Sunday asking me how my weekend was etc. I know she's into me but I don't know how to deal with a girl in a relationship.

Sorry if this post is long or in the wrong section. By my post count I'm what the French call a 'noob'.
Thanks for any advice gentlemen!