My gf got invited to go out with some female co-workers (who are all single or having marital problems). A girls-night-out sort of thing. The night isn't expected to start until 8-9pm, and is expected to go until probably 2am. I am NOT cool with this. I don't mind her going out with friends from work. I don't mind her having fun. But I do mind her having certain kinds of fun. And her drinking and probably grinding up on random guys is not a kind of fun I approve of. She already has a bad enough past as it is, and much of it involving alcohol and sex-driving environments like clubs. I would strongly prefer that she just avoid that kind of situation all together, but especially when I'm not even there. We've been together the better part of a year so far, and I liked to think that her whorish-party-girl days were behind her. She says crap like "nothing will happen" and that I just don't trust her, and that she "could" choose not to drink. But that doesn't make me anymore comfortable with it. I'm really pissed with her and barely talking to her. In fact, the last time I saw here was dropping her off at her mom's house a little bit ago and, instead of getting out and going in with her, I just drove on and went home, and she'll be locked out if she shows up here. Earlier she said "don't look at me like that, I haven't done anything wrong". I gave no response, but in my head I thought "yeah, you just eager intend to and don't give a shit how I feel about it". I'm was looking to marry this girl and have a family. But today I'm not as sure. Whether she comes home in an hour or 2am, I'm not sure I'll even unlock the door. Another "party girl" thing about her that has bothered me is that she agreed to go out without having any idea where they were going or how late they'd be out. Basically an open-ended "anything goes" situation. Am I the only one who feels this this NOT appropriate behavior for someone in a long term relationship? Maybe she's forgotten, but she's not still single, and I don't think it's ok for her to act like she is. At the very least, it's really inconsiderate and disrespectful to be out on the town doing whatever crazy single-person stuff, when she as a bf at home who has no idea when she will return, what/who she's doing, or where she even is. I don't want to be paranoid or insecure or controlling, but this just doesn't feel right. She accuses me of being a wet blanket and not wanting her to have any fun, and that there's nothing wrong with her wanting to go out and have fun. But I've already told her it depends on the environment. If they were going to a restaurant or concert or any other pretty innocent thing, that's fine. I'd hope they have a good time. But it's much less fine spending all night into the wee hours of the morning in an environment with only two purposes: getting drunk and getting laid, both of which she already did too much of before me, imo. A whorish party girl isn't the type of person I want to make a family with, and she was supposed to have changed. She's supposedly a whole new person since meeting me. The old her was somebody I could never respect, but that's in the past and she's supposed to be different now. But when she goes and does shit like this, things like what the old her used to do ..it makes me wonder who I'm really involved with.