Dame's still clearly hurt at what Jay did to him it's clear.
Dame fought and attacked everybody so all Jay had to do was just whisper something and it would get done. literally ruining every relationship he possibly could have had with major players in the process (along with screaming at the Weinsteins in public, one of the most powerful guys in Hollywood) and in the end Jay made the move because he was so established now, he didn't need Dame to do those things anymore..everyone was at his beck and call.
Jay and Dame were perfect for each other back then but at the right time he Michael Corleone'd the situation and we've seen what happened since.
Why dame scream at the weinsteins?