if my husband is cheating and a baby is on the way with the women can he still get his citizenship. he even went to put a separated bank account

So it is unclear exactly at what stage he is in the immigration process. If he has a two-year card and he needs to get the conditions removed you simply do not have to file jointly the 751 application in order for him to remove the conditions to get a 10 year card. You will need to discuss this further with counsel in a private phone conversation.