Abusive relationship

My fiance is very verbally and emotionally abusive. I know I need to leave him before we get married but cutting it off just seems impossible. I don’t know if I’m not strong enough or if I’m just scared of him. Every time I try to break things off he tries to convince me to come back or he’ll just corner me in the room and not let me leave. Or he’ll sit in my car and refuse to leave. He’s gotten physical at times and tells me that it’s my fault. I just need encouragement and prayers for me to get the strength to leave him.