some men who are happilymarried still try it...some cus they are insecure others cus people tell them the baby aint theirs or stuff like that. u gotta just trust thatbif he isnt good for you god will move him out of ur life. to make room for someone who is trully gonna step up. u need to focus on what u can do to make ur pregnacy and future motherhood sail smoothly. ur healthy and smart woman and are more than enough for ur little baby. the happier ur ex sees u. the more he will regret the decision to let you go. but dont be making it easy for him to be with u and her. u need to think about the above.
deny his petty hind parts. Completely ignore him and be happy. give it three months TOPS and his sorry ass will come crawling back, no lie. Just don't make it easy for him to be able to come back if at all