Now this is a tough situation.
I'm a flirt as well, but I always make it completely clear that I have a boyfriend and I'm off limits. I find it rather stupid that she would flirt with these guys knowing that your right there and watching what she's doing. I think she's going to far when mentioning anything sexually related. Especially comments such as "doing things for beer" or having sex.
Normally its good to check up on your gf/bf every once in a while. I mean, its expected that your curious or you just want to know how there day was. It looks to me that she's very untrustworthy. One lesson I've always agreed with is that, if you can't trust someone, then maybe its best to spend some time apart. I only see more pain in this situation because she's not going to change her ways.
Evil School!!
May not be on LF as much, due to unforeseen circumstances.
Blame College and Homework for Everything!!
-Fawn