100% agree with KML. I would absolutely go and be THAT girl. What’s your alternative? Stay home and conjure up all kinds of scenarios in your mind that probably aren’t happening? Or go...act all suspicious and standoffish and come off as a jerk? How attractive is that? You want your SO to look over at you and be proud that he is with you. I think it is great that he wants you there. It would be a bad sign if he didn’t want you there.

Bottom line...you can’t control who your SO is friends with and you shouldn’t want to. How would you feel if he started telling you which of your friends you could associate with and which ones you couldn’t? That would be a “hell no” for me. You’ve been with him a year and a half... that says something. He wants to be with YOU. He has chosen YOU. Don’t be that insecure person who thinks there is safety in eliminating anyone who could be a threat to them. That’s person’s biggest threat to their relationship is them...not anyone else. I think you should go with an open mind and heart and see what happens. You never know...you might really like her. If you dislike her that much without having even met her or seeing them interact, that’s not about her, that’s about you and your insecurities. Don’t be ruled by your fears. Go and have a good time.