Boyfriend is drug addict.what should i do?

i just had a baby girl 4 months ago.and his ex girlfriend had her baby yesterday i broke up w him for 2months and he knocked her up.its really hit me now that ive seen that baby's picture.he has no job and lives w him parents.the only problem is that my dad is a druggie too worse than my bf and i have to live w him.i like my bf parents that's the only place i have to go when my dad freaks out.what should i do?