This charming man

Ex-Husband I hope is what you meant. That's grounds for a divorce.

Cheating during pregnancy is unfortunately quite common. The STD is an added kicker because it risks your health and that of your child. Now the only question will be what you and your husband are going to do about it, whether you give him the boot, or if you really can forgive him, and believe that he's really willing to change. And given you were the wronged party, you're completely justified in either decision.

I feel for you, and your family. Sucks when you husband is a shit-head.