I broke up with him at that given moment and told him to leave my apartment which he did whilst crying.
A few weeks later I was still kind of angry that he cheated so I fxckd his biological dad. He had never seen his biological dad before and always said that his dad never treated him like a son or even put him first. So I tracked his dad down and fxucked him. To make things worst I took a picture of both of us and sent it to him with the caption well I guess you'll never be number 1.
This was a few years ago but I apologised to my ex and he apologised for cheating and now we're friends.