Cheating husband

Found out my husband cheated on me basically the whole time I was pregnant with our third. Shocked, disappointed, angry, sad, depressed. I don’t know details since he won’t admit it but it was with a coworker and he was either at work or with me, had his location. The reason how I found out is I tested positive for a sti while pregnant and checked the phone records. Found it all out on my own, since he didn’t have the balls to admit it. He tried to gaslight the hell out of me but he wasn’t going to fool me.

Don’t know how a person can be so evil and do that to his pregnant wife/mother of his children. Can yall give me advice?