Dont know how to leave

I dont know how to get out of my relationship. I've been with my fiance for 3 years and we have had a lot of problems. He is very jealous, controlling, and manipulative. But then he can be my best friend...

We have a daughter together whom is 4 months old and I know it is in her best interest if I leave him, but it is so hard. My family and friends are encouraging me to leave as well as offering my daughter and I a place to stay.

I get so worked up and mad at him that I come so close to leaving, but I just can't seem to pull the trigger.

I feel like a failure and like I'm disappointing everyone around me. I feel like a bad mom. I'm in therapy trying to work on myself, but I'm worried that I am going to lose all of my support if I continue to stay with this man.

I could use all the advice I can get please....