39 weeks and husband confessed to cheating

He cheated 4 years ago. Wasn’t gonna tell me, but a little blister came up on his area near his balls and thigh. He thinks it could be genital herpes, he says he paid a prostitute to give him a blow job 4 years ago. This was during a time when I left him for a pornography problem he had/visiting a strip club. I took him back, he has since changed so much, quit porn, and became a different man I’ve never known. But he kept this lie from me. We’ve been married 7 1/2 years, together for 9. I’m heartbroken, devastated, I don’t know what to do. I feel dead inside. The only thing keeping me going is my baby.