as I so rarely am but is she being unreasonable?
Backstory - DP and I are going away this weekend for one of his best friend's 30th b'days. It's a surprise party, all organised by his GF, he has no idea. One of the friends in the group is already not going because of existing problems, but anyway.
DP has just found out that another of his best friends, let's call him L, is not going, because his GF doesn't want him to go. Originally, L was going to go on his own, but now she's saying if he goes at all, she's going to break up with him. Part of the reason is that a girl he used to erm, shag, is going to be there. As far as I'm aware, L and this other girl were never serious, it was over before his current GF got together, and until GF found out, she actually got on very well with the other girl. Now, people are coming from all over to go to 30y/o blokes b'day - DP and I are coming from another COUNTRY (admittedly it's only a trip on the Eurostar, but hey). His GF went to all this effort, he has no idea, and then when everyone turns up, apart from L he's going to be quite hurt. L's one of his best friends.
So is the GF being unreasonable? I too was not overly happy meeting an ex of DPs (especially since douchey friend kept on joking "maybe DP should get back with [other woman]" "at least DP always has [other woman] to go back to". Douchey friend was in muchos trouble for that), but then, I'm sure that if it was this kind of situation, I would set my own feelings aside. This is the only time in a year that all the friends can get together too (because they're all over the place), and she's kind of ruining that.