Broken Hearted Girl, Any Advice ???

I was dating my best friend for about two years now. The relationship wasn't perfect but we were madly in love with each other. I had never felt so in sync with anyone before, we would finish each other sentences. We were always together. We work together but 2 weeks ago we broke up and she slept with a girl at our job. I am so emotionally devastated I have cried so much because on top of everything she doesn't even seem to care. I went over to her place and we had a long conversation about our relationship. Cried our eyes out snot tears slobbing, this is the day she told me about the girl. I was furious and left her house. Soon after she called the girl from our job to come over and I went back to her house to find her there, she also let the girl stay the night and took her to work the next morning. I feel so stupid and broken. I don't know what to do..... I am married to a man, she was okay with it at first, then she started to want to just be together just me and her. He knew about it too I have always been in love with woman. I dated him because my family are all christians and ofc these relationships are frowned upon, so I dated and married him to make my family happy. I have never been completely happy until I met her, but could never bring myself to leave him because he is not a bad guy, he loves me. I can't see people hurt so I have always chosen everyone's happiness over mines. She said she slept with this girl because she wanted to stop feeling how she was feeling. We haven't talked much because she is saying she still hasn't had time to process everything that's happened. I have told her I am willing to leave now because I want to be happy and I'm tired of living my life for other people. She still continues to hang out with this girl she slept with