I’m so stupid

I’ve been with this guy for 2yrs and I have tried leaving him twice but he always wings me back in. I feel like I’m settling but yet still stay with him..I just don’t know how to move on because he has a daughter that I am so attached to. Yeah y’all can be like “so that’s not your daughter move on” I know she’s not my daughter but being in a kids life for 2yrs and bonding a string bond with her then just up leaving is going to be so hard for me to do..I realized me and her dad don’t have nothing in common (we stay arguing) even in front of her...(she probably goes home and tell her mom) I try not to argue with him in front of her but the man just doesn’t stop. I’m not in love with him no more..are hearts are sooo different. I really want to be done with him but it’s like I need motivation to just end it completely 😫