Let's see what I can think of: You could hate him, you could keep looking for opportunities to hurt him, and then continue a cycle of retaliation that might hurt your team in return.
Or you could, perhaps, let it go. Let him go. That's the hardest choice, since you obviously cared deeply for him. But it might be the choice that allows you to move forward, to help your team overcome their difficulties in turn. After all, they need you more than they need Parrotman.