Umm...I say get over it. You gave her advice and she chose to do the opposite of what you wanted. The situation turned out to be fine. I think you're making way too big a deal out of this. I think you need to trust her when she says she knows the situation well enough.
I'm mostly in agreement with
leekohler. The guy is clearly a snake in the grass, and everyone knows it. But you two are into each other, and the guy is some kind of friend/ex-coworker that she hasn't seen in a while. So I'd say this was one of three main scenarios:
1. She's damn clueless about what he's going for, and needed you to spell out all the implications of a late evening rendezvous in a hotel bedroom. Well, only you know, is she really that naive?
2. She's flirting with the idea of maybe staying faithful, or maybe getting with that guy, and was just going to feel out the situation. Only you know, is she trustworthy, is she fully into you, are things going well between you two?
3. She knows the guy has an agenda, but doesn't give a rats ass because she knows she's not going to go for it. Coffee shop, hotel bedroom, sex dungeon, doesn't matter to her, she's not interested. Wants to catch up, might have been manipulated or guilted into going, but nothing's going to happen.
The tough bitch of it is, if we was in scenario #3, then acting all distrusting is probably hugely offensive to her, since she knows she's solid. If she's in scenario #2, then it gets grey because of course you should stand up for yourself, but also if she's not all that into you, it might be best to see how far she strays so you know to kick her to the curb.
It sounds like you clearly communicated everything to her, although it's not clear how much you listened to her, or simply asked her what her motivations were.
Dump that cheating skank. Why would she want to catch up with some creep who she doesn't even work with anymore? She has no reason to hang out with this guy.
I trust my girlfriend completely, but if she wanted to hang out with some other dude who used to hit on her and wanted to slam it in her at some hotel, I'd know something is up.
You're getting played. If your girlfriend really cared about you, she wouldn't be at a hotel with some guy, she would have respected your feelings on the subject and told the guy it wasn't going to happen. The fact that she even asked you about it, and didn't flat out tell the guy to pound sand, shows she's up to no good.
I wouldn't assume she'd cheated, but I'd ask very specific questions, and explore any ambiguity of the responses.
And it does raise the question, as to why she caved on going to the room instead of the hotel bar. Is she weak willed and easily manipulated? Personally I'd have no problem saying no, but some people are really conflict adverse, and can get into situations they don't like if the other person is forceful enough.
Seems like she was more concerned about upsetting him than me lol which is awful.. but deep down I don't think she meant it that way. She's just blind...
Yeah, sounds like a pleaser, and conflict adverse personality. She "knows" you'll understand since you're probably reasonable and communicate well enough, but might not want to deal with the hassle of pushing back against his requests because he's not as close. It's a bit of a paradigm shift for people like to realise they have to put their close people first.
Exactly.
Then she told you part of the story to make her be able to live with it to trick her mind in to thinking she fessed up and you can now forgive her.
Again, it's all in calmly, non-accusatorially, simply asking what happened. And following up any ambiguity with more probing questions.