What should I do

So last year my babydaddy left back to Mexico for no reason n left me n my now 1 yr old alone. A month after he got over there he got with a pregnant girl she was pregnant from some other dude that left her n now he’s been with her ever since n he takes care of her 3 kids. She already had the baby n he post pictures with all of them. At first it hurt me bad but now it doesn’t bother me I just laugh. A couple of months ago she started texting me whenever they would break up n ask me if he would hit me or do stuff to me n I would tell her yea because we were super toxic n abusive. Now he’s the same with her on n off n toxic. Which is none of my business but she’s the first to text me when they break up but once they’re together she stops. 2 months ago they fought n we were texting about the baby because I still was nice n kept in contact with him for the baby. Well he started flirting bc they had fought n I ignored it didn’t say nothing back bc I had told both of them from the start that I would respect their relationship. Well she saw the messages n slapped him n he was pissed n started talking shit to me n was like tell the baby that I’m not her dad that someone else is her dad n I never wanna see her again. Then a week later he calls n says sorry. Me being nice or dumb idk but I was like it’s fine n still keep sending pics of her to him. We’re friends on Facebook because I post pics of her n he wants to see them too n lately he’s been posting pics with the baby saying he’s a changed man n it makes me laugh but it’s embarrassing bc he doesn’t even watch his own kid.!! He said he loves being with the kids n taking care of them bc he feels better since all the time he’s lost with our baby n thinks of our baby when he does that. Should I stop all contact with him n remove his name from the birth certificate were from Texas. He’s in Mexico.