Is it worth It ?

I was seeing a sag and he has an ex who in fact doesn't tend to his needs and doesn't stay loyal towards him . Me and him aren't talking at the moment but I know he does like me generally. His ex cheated on him and constantly finds attention from other men . Why does he go back to what he doesn't deserve . Is this worth my time to wait

Nope, he has a low sense of self worth. He's willingly putting himself in a bad situation because he doesn't believe he deserves better.