should I take him back?

I dated this guy last year and I broke up with him after I found out he had a girl living with him. he was in a hard rock in life going through a custody battle with his ex girlfriend. I broke up with him and the girl that I found out he dated seem to be only needed to win custody. she contacted me the day she seen my number pop up on the phone along with an "I love you message". I told her how long we been dating and she started telling me how she went to the court hearings with him during the child custody hearings and help him out with bills. after he won custody she wanted a baby by him. she told me over the phone they agreed to have a baby and they are getting married. he now has a son and throughout the time we was separated he still contacted me begging to have me back. his mom and family were all confused about this girl he's dating. according to his friends, they didn't know each other a month and she moved in not even a month after his last girlfriend moved out. he offered to take me shopping, take me out to eat, and get my hair done. I told him this wasn't enough. he made a decision to stay with the girl as she was involved in the custody hearings. he has 4 kids total but someone else is already interested in me. what do I do in this situation? he's been trying since last year.