Need advice please! He wont let me break up with him

Friday night I broke up with my fiance. I posted on here before about him tracking me with GPS and just being really controlling. So I took the baby and have been staying with my mom.

I have left him like 3 times before and he always always talks me out of it. I have tried to be firm this time, but he is making it so difficult. He is begging, pleading, complimenting me, saying all the sweet things I never hear him say... it is really messing with me.

Does anyone have experience breaking up with someone who just wont stop trying to talk you out of it? How do you not feel terrible? I feel like I am abandoning him but I also know this is what is best for my daughter and I. (He keeps saying it is going to ruin her life)

Any advice is appreciated!!