<human>: Can you provide a brief overview of the text?

I had a rocky few months with my gf and we officially ended it about 3 weeks ago. No cheating or big fights were involved prior or during the rocky months, we just kind of grew apart. Don't want to go more into detail. Anyway, I was and still am hoping that we could somehow fix it and now it turns out she's seeing a new guy, a friend of mine. Not bestfriend-tier but still a guy I got along with pretty good. 

I honestly have no idea what to do anymore. I can't stop thinking about her and the idea of her with another guy drives me insane. She said that for now she feels happy with him but she also said that she knows what she's doing is wrong. What the hell am I even supposed to make of it? She said she doesn't love me anymore but still cares for me and decided to tell me about the other guy herself so I wouldn't hear it somewhere else. I appreciate the gesture but my heart got broken all over again.
<bot>: ex-gf started seeing a friend of mine, very confused as to how to deal with it and how to move on. I'm still very much in love with her and I feel totally lost without her.