Escape a DV relationship

Im a min at age 23 with a four yr old and a baby on the way...my bf has flipped out and became extremely abusive. He has threatened to kill me and my family..saying that whereever I go hee will find me. He has held me hostage in my own home and I lost my job because of him. He even threw me into my bedroom wall. I know with time itll only get worse. I need a way out. Honestly I dont want this baby im pregnant with if it means I have to have ties to this man I fear. I cant have my son seeing this...hes just four. Id rather live life as a single mom than be with this man anymore im too afraid to call the police hes a Blood and has other gang members all over the city..He has people or informants watching my home and me...this is crazy and serious...plz help advice