Okay first off he cheated and got another girl pregnant. He didn't have anything to do with you threwout your pregnancy. If this guy loved you he would have been there for you and the baby. If he wanted to be apart of the babies life he should have been there from the start. I think he had a change of heart because he got scared and child support. He went right back to his old ways. Thats a sign he isn't going to change. He isn't coming home at night, if he cared about his child or you he would be there. He wouldn't be off dating other people. He could obviously give a crap less, and he just sweet talked you into moving back in so he wouldn't have to pay any money.
I understand you want you baby to have a father. But you also have to realize he isn't being a father. What has he done for the baby so far? He left you during your pregnancy, he wasn't at the hospital when she was born either was he? If he really cared he would have been there the whole time. He got another girl pregnant to. Thats another sign.
Your baby deserves a father, one that will be there she is 3 months old. Well if you move back home and fall in love with someone else, they could become her father. And you could have someone to love you both for who you are and not have to worry about a girl coming up knocking on the door pregnant.
You shouldn't had to have deal with a guy that has cheated on you, that has not been there for his child. He doesn't come home at night. What type of life do you think your child will have when she gets older and you two are still together? He kicked you out when you were pregnant for stupid reasons would you want your child to see the way he acts. Just think if he acts this way now how will he act the longer you two stay together?
This is just my opinion, I grew up without a father he was alot like this the father of your baby. He was married to many different times, and had six kids. I met him once and all the years he never believed I was his child. The day he saw me he and I both knew I was his child. But I have never wanted anything to do with him. I never wanted anything from him and never asked anything of him. He didn't even know my birthday, he died this past year. I met him once and I didn't even say one word to him and he was to afraid to talk to me I was 8 now I am 18.
I hope you can make the right choice for you and your daughter I hope my reply has helped you in some way. I am not a mother myself, but I know it must be a hard decission to make. I hope everything works out for you and her for the best. My best wishes are with you. :)