I need to leave town from my ex fiance & take my baby with me!! HELP!!?

I am a 23 year old single mother to a premature baby boy who is still in hospital. My ex fiance is in an outlaw motorcycle club, he was born around that his whole life. Him and i broke up before our son was born as he was constantly cheating on me with random woman/one night stands. He always tells me he wants us to be together for our son & because he loves me. I love him also but not enough to live and raise my son around that life. There is NO WAY i will allow him fallow in his baby footsteps!!. I recently seen the 'crew' do some stuff and really want to get out of that town as i cant stand living here anymore. Everyone is very close-knit and my dad who is also in that 'crew' is in prison, It drags me down and i want better for my son and myself. I was thinking when my baby is able to come home i was going to leave town with him as i have helpful friends in Pennsylvania who want me to move there, I have a good job also. My ex fiance always goes to see our son and his mom is very controlling so how would i go about this? Please help?