Background: Let me start by saying I'm fairly picky about the girls I want to be my "girlfriend." The kind of girl I like is secretly nerdy while socialable and likes to party and have fun, anyways I have trouble finding these kinda girls, that are also hot enough for me to want to date.
Anyways, I met this really cute girl a little over a month ago that totally fit the bill, plus she was super cool and smart. After texting her for about a week, I was totally like this is the girl I want to try for something more than a one night fling with. Anyways we went on about three dates that following week and by that time I had "F" closed her. Anyways we had sex a few more times the following week and I asked her to be my "girlfriend" and she agreed. That was good for about another week, good communication, the sex was decent, and we had a lot of fun. We would literally spend the entire weekend together and it was pretty awesome. Anyways, starting from about last week she started her period, went back to school, and basically lost all sex drive and I was getting really weak IOIs from her. So I was racking my brain trying to figure out what the heck was going on, I brought it up with her and she mentioned that she doesn't like to have sex on period because she gets yeast infects a lot when she does. I looked it up online and that checks out. Anyways this past weekend we did a road trip to a neighboring city and spent the whole weekend together, sexless, as she was still on her period. Anyways, last night, she texted me and wanted to come over to "watch a movie" (this is code for "sex" to me), and I agreed. Half-way through the movie we start making out , etc and she still doesn't want to have sex. I end up having a conversation about why she doesn't want to have sex and that the kissing etc seems to be lacking. After to talking about it for a bit, she responded that she still wanted to date and that she only dates one person at a time but she doesn't want the title of "girlfriend" because we are moving too fast. I told her if we're just dating, I will date other people too.
Cliffs: Basically, although we haven't "officially" stated that we're broken up, we're currently just "dating" and no longer b/f and g/f. Also it's basically implied in her diction and body language- she won't escalate to sex. I'm pretty sure she's already seeing someone else, as that's what her facebook check-ins indicate. This normally wouldn't be a big issue but while we were going out, she asked me to Vegas with her and her two girlfriends and some other guys that she knows. Basically I will be sharing a bed with this girl and one of her girlfriends that's currently single.
Update: Last night, we went out got drinks and generally had some solid conversation, after a few drinks I started getting Kino IOIs from her and we ended up going back to her place. She mentioned how tired she was once we got inside her apartment and I basically stated I was too drunk to drive all the way home. We end up getting in bed together and we kiss a bit and then I start generally feeling her up. After a couple of minutes she started to become more responsive and rub her hips into my hand and almost immediately after she grabbed my hand and moved it away from her body. This happened another two times before I gave up for the night.
Situation: So now I'm going to be spending a a few nights in Vegas with this chick and splitting a hotel room/bed with her. How do you guys think I should proceed? Should I try to game up her single girlfriend, should I just hang out be "cool" and go back through an attraction phase etc, or should I just bounce when I hit the strip and do my own thing? I've done one-night stand pick-ups before but it's not something that I really excel at. Also as I'm sharing a room with two chicks, things may get messy if I start pulling other chicks, because I'm going with HER social circle and these are basically people I've never met before.