43m 31f been together 10 years. So last week my gf comes to me and says hey, I'm off next week from college. I'm going to meet some friends I have been chatting with over the last two years and they are 18 hours away. I'm going to drive there and stay with them for 5 days. I told her I didn't agree but she didn't care and went anyways. I have never interacted with any of them. I didn't know the address she went too. We have been having a lot of problems too. When she came back she still has zero regrets and says she needed this. I have also seen messages between these friends and her portraying me in a negative light by both parties. Right now I am upset but don't know.what to do. I love her but trust is broken.