Is she attracted to another guy?

I am 17 and I dated a good friend of mine for 6 months or so and it was a pretty serious relationship all around. we got caught in the moment of an argument and went to the point were we broke up about a month and a half ago. we still are currently...

broken up, but we still have been seeing eachother pretty much everyday during this summer. recently things have gotten quite serious again and we are planning on dating eachother again quite soon. I found out from her best friend that she never really wanted it to end, and neither did I. I was very comfortable again wit her again until about a week ago when we went to our friends box social there was alcohol and bud and we did some of it. we were togther basically the whole night, everyone had been drinking and one of my friends had gotten pretty drunk, he was making a lot of contact with everyone girls and guys in a friendly gesture. although she was sort of drunk she took it in a way and I think she was flattered. she stayed with me the night but she every now and then she bumped into him and seemed to give him some unusual attention, I was shoked because shes not really a friend or anythign with him, she just knows of him because of me and school. I noticed later on in the night she made some unusual contact with him again, it would be considered friendly if you were drunk but by then everyone was pretty much sober. I also noticed her looking at him a lot, pretty much checking him out, I thought it was just me but then my best friend who I believe after the party told me he noticed it too, which got me a little paranoid. the next day I had a very long talk wit her, I told her what I thought but not directly saying do you like my friend instead of me, I asked her things , like if she is really happy with me or if she should try someone new even though thats not what I wanted to hear, because this is her first real relationship according to her friends... she is 16. I brought her to tears and thats how I knew she was true to me, then this past weekend my best friend, his girlfriend who is actually my (*girlfriend in progress*) best friend, were all together at my best friends girls house. then the guy or my friend from the party came and a few other guys came by just to see what we were saying, when he was there he paid little no attention to my *girlfriend* so I knew it wasnt anything, but I went to ask a question to my *girlfriend*,she was just staring at him and constantly checking him out, and when he arrived her body language changed to more of a distance from me and she stopped smiling at me kind of thing when I looked at her etc. I still stayed with her and we still talked and she seemed very normal and happy like the girl I love her for. I dont know what she thinks of him but I think maybe there is an attraction there. I dont want to ask her about it because I have a feeling that I could be so wrong, but I still need a find a way to find out. maybe like a list of things like body language I should look for, and most importantly if I should ask her, why is she doing this and what I should I do because I do love her and I know she does too. I plan on staying with this young woman for a while.

2 questions back to you. 1; is it okay for a guy to be drunk and flirty but not a girl?
2 ;bringing someone to tears is the right way to get an honest answer?
I think you shouldn't worry so much. If she wants to be with you she will. If she doesn't she won't. If you love her and want her to be happy let her decide and have fun.