Boyfriend drama

Found out my boyfriend has a kid and still loves his ex. The kid is biologically his but mentally he is. I don't know what to do. We have been fighting for like three hours over it.

UPDATE:: I broke up with him. We were fighting. And I was trying to call and he wouldn't answer. So I got my friend yo call and he answered her and said he couldn't talk to me because he was on the phone with his ex. Then I messages saying "boi answer I ain't playing" the. We got in a fight and he says "it is 1 in the morning you need to calm down or I'm leaving" and well I didnt clam Down. So we are now over.. And u don't know how to feel.....