Hi Welcome!
Im so sorry to hear about your predicament. I agree with the others, he is legally liable to support you. However, i would think about it before making a decision, reason being is that if you involve him ie. Child Support Payments, he/his parents (who will also have rights to the baby) may want to have time with the baby, this may involve a expensive court battle and may even entitle him to 50/50 custody of your baby. He may say he wants nothing to do with the baby now, but things can change and he can take you to court at anytime for custody. The Family courts view is that equal time with each parent is best for the child, that is as long as there is no violence/drug abuse etc on his part and the baby will be safe in his custody.
Don't mean to upset you, but these are real possibilites and you should get some legal advise asap.
Good Luck
XX