Relationship problems! any advice?

ok so here is the prob i got pregnant with my my ex boyfriend ariel but i left him and moved out of state when i was 5 months because he was addicted to drugs and he stole cars he treated me like crap when he was all drugged up now my son is 7 months and i moved back to oregon and about a month ago he left to OYCP its kinda like bootcamp because he says he want to change for me and our son and i said i would give him a chance if he made it through and changed but i recently started talking to my other ex adrian who i left for ariel without him doing anything wrong our relationship was perfect but i left him anyways and now i'm starting to fall for him and idk what to do who should i be with i like them both and ariel is coming to visit in about a week and idk what to do HELP!!!