Anxious of husband cheating

Not too long ago I found out my husband cheated on me with his child’s mother, after some thinking I decided to give things another chance. But lately I’ve been feeling this horrible anxiety whenever he’s away or I’m supposed to be sleeping, I’m afraid for the next time I catch him doing something. I dont snoop or anything. It’s so hard to leave when I’m 18 weeks pregnant with his baby. But the more time that passes the more im thinking maybe I can’t forgive him... before he cheated he was the perfect husband, did everything for me and was always there. Bought me flowers, took me out, we had sex every single day and he still did it! Theres no way for me to ever know if things are better now because he acted it out so perfectly before I found out he was doing it the first time. I don’t know if any of this is worth the anxiety anymore.