Going thru hard time. need to vent/talk?

so my bf and i have been dating for almost 3 years. 1 year ago i got preggo. after a while i found out that when i was on my florida trip (i got preggo almost immediately after i got back) that he was planning on breaking up with me from. then baby came and he decided not to, hes got anger issues. he says he'd never lay a hand on me but for someone that gets mad quickly, throws things across the room, punches holes in walls, and only threatens to throw stuff at me im scared one day he will. last night we got into another big fight where i take all my hidden feelings and tell him everything, he gets pissed and argues back, he tells me he doesnt want me to leave but acts like hes not in love with me anymore, and NEVER wants to be with me in public, blah blah blah. i know i need to get out of this relationship cuz weve done this dance 4 times now and it never gets better. he says if i leave with my daughter he'll report me for kidnapping. i called the cops to see if he could get away with it. they said since we arnt married she is legally MINE and he cant take her from me. that finally made me get the courage to leave knowing i wont lose her and his history of holes in walls from anger and whatnot, ill win any custody. his ENTIRE family is on my side 100% which helps a LOT. problem is i plan on packing up and leaving while hes at work and tell him im gone when im a ways away (i moved to SC from OH). it kills me to know he wont get a proper goodbye with his daughter and im still completely in love with him. but if i told him i was leaving he'd either yank her from my arms and leave or take 1 of his 2 guns and kill my moms bf (hes threatened to do it b4 but only to me). my mom and her bf are taking the 15 hour drive here on a moments notice to help me out. i know i need to get away for not only safety but my mental health (i know im clinically depressed, just dont take my pills anymore. he wont let me). but he came home from work just recently and is being nice and whatnot. that makes me regret leaving. i will leave tomorrow but i need to know what im doing is right. i need support.. i have no friends here so its not like i have a shoulder to cry on. give me your input please