I feel really ridiculous asking for help online like this, but I don't have anyone to ask whose position is impartial, and so I'm turning to you guys. I've been in a solid relationship for a little bit over a year now; I love my girlfriend, and she loves me. But over the last several months she has been getting sadder and madder at me with increasing frequency, and that has all hit me at once. Her anger stems from the fact that I have become very close friends with a number of girls who used to be best friends with my girlfriend. I first began spending time with them while I was with my girlfriend, but over the last year my girlfriend stopped hanging out with them, whereas I began spending time with them more and more - I really connected with them. In a word, she feels jealous about the situation. She doesn't like that her ex-best friends and I are becoming best friends, and it doesn't help that there are (untrue) rumors circulating about me and one of these friends having an affair (sounds silly because we're in high school). My girlfriend has given me an ultimatum to either break up with her or stop being friends with these people. I said I'd stop being friends with them because I didn't want our relationship to end, which is true, but I'm very hesitant about that decision. These girls with whom I've recently become friends with are some of the coolest people I know and I relate to them as much as if not more than any of my previous friends. If I stay with my girlfriend, in order to make her happy I'll have to stop being friends (sever all contact, essentially) with a group of people I've become very close with. It's been made clear to me that there is no other option. I just don't know whether or not I can do it. I'd love some input, and thanks very much for listening to me.