stay or let go when she is pregnant

Well how do I began........I have a one and a half year old kid and now a 10 week pregnant girlfriend who I think is seeing someone else.She just moved out of her moms house and in to her own apt.For right now I live 4 hour away from her and go see her and my child every weekend.We had a big fight that went all the way to court ,and now we both just realized that we both still love each other and should give it a try again .Well when she told me she was pregnant,she said that she did not want to keep it and I did.She said that she just could not do this right now and there was no way right now that we could,so after that I was like maybe she is right and I was like we can't have this.So she went back home and it seemed like her mom and her friends told her they would help.so it as like if there is going to be someone there to help me then we our have this baby!!!I was mad as hell.To me it seem that she wanted out of her mom house to getting pregnant lead to her mom saying you have to go and I will pay half of your rent and that what is going on right now!I was mad as hell and I did say some mean things.There was a time I tried to brake up because I was not happy with what was going on,but she did not want to do that,but she did say if I don't love her then someone else will.Will a few weeks ago it seem like she stop caling me as much as she did, and she seemed like she only could talk for a few sec,and one time we just did not talk to each other for a day.Well the first day at her apt I picked up her cell phone and seen that she had been talking to some guy that she was dating right before we had got back together.She had said that she quit talking to him because she said she loved me.So in her cell I had seen that she had called him and he had called her.Then in the text it it said that he was going to get a room and she said yeah ok!So when I asked her about the text she lied and she she did not text him,and the about 3 min later she said im sorry I did talk with him.She hit me with well you said you were going to brake up with me and I just need someone to talk to.Every time I bring up the text she acts as if I did not read the dam thing.What should I do?I know she is the type of girl that if one guy ain't loving her she will go some where else and get it!Now they think I should give her a ring!