<human>: Provide a brief overview of the text.

We have been going out for a solid year and 7 months now. Looking at other relationships it seems like we have been able to get through a lot more than most people can handle in high school.  But the problem is that she recently lost all of her friends, and now has started to hang out with all of my friends (a mix of boys and girls). She was at one point especially attached to one guy in the group, but they have kind of gone their separate ways after i talked to them.  But the point is that I've come to realize that absolutely despise hanging out with her when she is with my friends.  She acts in a completely different way when she's with them and i dont particularly like hanging out with my girlfriend all the time i hang out with my friends.  I mean i love it when its just my girlfriend and I and almost everything is okay there.  And i tried to talk to her about it and she took great offense to it.  So its coming down to the point where i want to end it.  But at the same time i dont want to end it because i love it when its just us going out.  i just need some advice...
<bot>: Girlfriend of more than a year hangs out with my friends and acts like a different person.  Need help deciding what to do.