Advice please !!

I’ve been with my BD for 3 years now and it’s such a toxic relationship . So much on and off. Should I let him go ? I did multiple times but he keeps coming back and apologizing and saying that he loves me and he doesn’t want anyone else blah blah blah and how he wants to have a future with me and I understand him because we have kids you know ? We get into arguments a lot and it’s over the littlest things and the main thing That irks my nerve is that he’s 3 years older than me and he’s so immature. People literally tell me he’s my child because I’m the one who thinks for him and tells him what to do and whenever he’s going through something , I carry him on my neck. He’s a great father but I feel like this relationship is draining me. I tried to put the pain and toxicity to the side but it’s so hard especially when we have kids. I love him but idk what to do about it. I know my kids should be growing in a two parent household but is it worth it ? I feel so stressed to the point my migraines are terrible. We argue a lot like a lotttt so what should I do or what do yall think ?