He won’t sign the papers

So I filed for a divorce. My husband cheated on me more then I can count and was telling people we was married that he having problem in our marriage and sleeping in different rooms. When I’m thinking everything fine. Until I decided to look through his phone and also caught a STD that was luckily treatable. That’s how I found out because I know I wasn’t sleeping around. Anyway. I went to serve him the papers and he won’t sign! He begging and pleading to try. I’m like hell no. You gave me a disease. I just wanna be free of him and just co parent. Anyone have this issue where the husband won’t sign??? I am tired of him