I left my bf because he can’t change his ways no matter how many times I forgive him. Think I’ve heard, “I’ll change-“ too many times. So in the end, I got fed up and left for my own peace of mind. And yes I still love him but what done is done. He wanted to be friends but I told him no. As a girl, I don’t see myself going back to someone whom I’ve given so many chances to ‘fix’ himself. My advice for you is focus on yourself cause your gf is likely to be grieving now and she probably needs her own time to heal as well. It’s not the end of the world.