Hi I'm 20 and I've just come out of a two year relationship we were meant to be getting married as I have a child, anyway he left me and every time I ask him why he says that its all my fault and we weren't good together... I'm really finding this hard to deal with as I loved him with all I have, I want to try and prove to him that I'm doing just fine and not begging him back I'm even going as far as planing a night out! Also he hasn't even tried to see the child and when I said to him to come see her he doesn't reply I have even said that I didn't have to be here as I don't want her to suffer what am I meant to do every day he told me that he loved me and couldn't wait till get married and spend the rest of his life with us and than one day that all changes what do I need to do??

The first thing you need to do is make sure you will be getting child support from him.
Don't get involved with anyone else just to prove anything to him. Get child support, then move on.