May I ask your ages?
You were not married. Why not?
Were you living together? Was the pregnancy planned?
He acted out sideways during a very stressful time. You can give him the benefit of the doubt, or cut him off from you , only.
Is there extended family around? You need help, but not necessarily from a new father, especially if he is young. Get an older woman to help out.
And remember: He WILL have a relationship with the child, if his name is on the birth certificate. That will be arranged thru the courts. And it will be between him and the child.