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What would I do? Well, I'd have a talk with her. And not a scolding talk, like she is a 2 year old. I would treat her like a grown up. If she continues to act like a 2 year old after I've been acting and also talking to her like a grown up, then I'd know she is actually a 2 year old and find a new GF. Unless 2 year olds are your thing. I know some guys who seem to enjoy fighting and drama in their relationships. What I've also noticed is those guys are as screwed up emotionally as their 2 year old GFs. But that's another topic all together. Let's get back to you:
So how does talking to her like a grown up work? Well, you ask why she was so upset. She's going to be angry, just expect it and try to not get angry back (making things blow up). After hearing how she perceived the events and what caused her to get so upset, explain to her your side. Hopefully she listens. If she doesn't, remind her you listened to her perspective. Keep explaining, discuss where the communication went awry, and how we can prevent this from happening again.
I basically advised along those same lines.
However, so as not to ruin the OPs night out, and therefore get him angry at her in the process, sometimes the alpha logic of just setting clear boundaries and
not allowing any bullshit from GFs works wonders to remedy the situation at hand - sort of like saving a soldiers life on the battlefield: it wont be pretty or the best long-term solution, but it solves the current problem to allow life to go on without, as had happened, fucking up the OP's night (even when he did all the right things, letting her know in advance, trying to contact her on leaving the bar, etc).
What you suggest Hobbit (with all due respect) is, as you say, intended for a more mature mind. That is why I asked what ages they are. Maybe she's not mature enough, and still needs some relationship molding, or maybe she is used to explosive emotional relationships, and when that's the case, you need strict control to handle the initial the GF's urges to act like she did in her previous relationship.
After the initial containment, with a little water under the bridge I always found it easier to speak the more rational thoughts and
TRY to get a woman to logic with me (but fuck that's a whole other ballgame there isn't it).