In order for a relationship to work especially after your mate has cheated, then your mate has to show that he is truly sorry for what happened and that it won't happen again. He is suppose to be trying to get your trust back and proving to you that he is worthy of having that trust back and the fact that he neglected you in your most vulnerable time while you were carrying his child shows you that he isn't very trustworthy, trust must be there to make it successful, and even after the baby he still continues to take you for granted and not help you out. If the trust in your relationship isn't there, chances are that the relationship will suffer in the long run. If you are constantly questioning or worry about your relationship, then you have no trust in your partner. If you trust in them, then you know that they have your best interests at heart just as you do for them but your boyfriend just doesn't show that and he seems very selfish and a bit uncaring.
If you are in a relationship where you have given trust and that trust has been abused, then you are in a failing relationship. Unless you commit to trusting each other 100%, you will not succeed in your relationship. And, in the end, if that trust is getting abused and taken advantage of, then, you shouldn't be in that relationship. If you've given so much more in your relationship and still your partner gives nothing in the relationship then why stay and put yourself through that misery any longer? Yes when you decide to forgive someone and try to fix the relationship you should try to get past the past but that is only when the cheating mate shows that he is remorseful for what he did and your boyfriend just isn't doing that. You have two alternatives; first being to stay in a relationship where you are not happy and there is no trust and hope that the relationship somehow fixes itself or end the relationship. It is hard to end a relationship especially when you have a child involved. That does not mean that it is not the best thing to do, for everyone concerned. If you are in a state of constant bickering or outright fighting, unhappiness and depression, you are not being noble by staying in your relationship. You are harming yourself emotionally because you are doing everything and he still isn't showing you that he is responsible and trustworthy.
You have teach your child what a good relationship is, you are cheating yourself out of a rewarding life and you are enabling him to continue to not support you or his child, if he isn't giving you money to help with the baby then you have no other choice but to make him pay for his responsibilities through the court. You can still allow him to see his child if the two of you aren't together but you have to want better for yourself.