If you truely believe your child would be in danger or neglected don't tell him you are pregnant and get out of the relationship. I know that this is not a popular opinion to most people. Just make sure he never finds out about the baby because he would have rights.
Lots of single parents do it on there own without any support and it sounds like your parents and friends are there for you.
His daughter is not your problem. That is for her mother to worry about. It sucks but thats the way it is. Your child has got to be your only focus right now.