<human>: Can you condense the text into three sentences or less?

Long story not-so-short: went to a party a couple of weeks ago, and I met a girl there. We hang out a couple of times, and she tells me that she's also seeing someone else (from that same party). She wants to do the casual dating thing until she knows us better; I'm fine with it, other guy is not. So, she decides to go with the other dude since she technically was with him first. Whatever, I'll move on.

Even after she tells me this, we keep talking. Not just friendly banter, but more personal stuff, like past relationships and whatnot. I meet up with her and explain that she's confusing the fuck out of me. She keeps telling me the same thing: she wants to stay in touch with me, but she has to be respectful for the other dude.

She ends up coming over that night. We have sex and she sleeps over. I figured she had made up her mind and we were all good. She seemed a little more distant over the next couple of days, so I call her and ask her what's up. She told me she felt bad about what happened, and doesn't think we should hang out any time soon since she still has strong feelings for me.

Now, all this time, the vibe I'm getting from her is that she doesn't really have any feelings for the other dude, but she doesn't want to seem slutty, for lack of a better word, and just ditch him for me (we kind of have a common group of friends, though I don't interact with them too much). So either she's been dishonest with me about her relationship with the other guy, or she's just being dishonest with herself and ignoring her feelings. I really have no clue at this point.
<bot>: Met girl at party, hit it off, she ends up being in some sort of quasi-relationship with another dude, we have great chemistry and sex, she feels bad about it.