my fiancé cheated on me and lied when caught

Yep he seems to have been questioning his sexually from before we were together:.... I found out on his phone that he was basically cheating on me over the phone. There were lots of people he had been talking too.... on top of that he had talked and HUNG OUT WITH one of the people the week before I found out.... The crazy part is that I was sick to my stomach when he said he was going to hang out with a friend from high school. What's worse is when I found out and called him out he told me he hadn't done it but he was "catfishing for someone who was cruel to him in HS" only to find out he was lying about that too. But here is the big twist in the story....