He killed the joker.

[There had been so much going on. Bruce hadn't thought that Jason had what it took to be Robin. He'd let him go, and that was the straw that finally broke the camel's back. Not that Dick knew that. It had already been hard on Jason, fighting with Dick, being dropped, abandoned, dumped by Rose, then rejected by the only person to ever show a modicum of attention to him. He was already juicing on the new fear drug. It was easy for him to pick a fight with the joker.

Then Dick discovered that Bruce had been searching for new Robins before Jason's body was in the ground. New weapons. Dick and Babs let Bruce have it. They weren't going to be as harsh, but he lost it, Babs already knew what he did because of her father. The next thing Dick knew he was looking at a bloody crowbar, and Bruce was leaving Gotham. ]

He. My Bruce never knew I died. He left. He gave up being Batman for a while after. He had to. He wasn't ... himself. He's not you. You know. I know it. He never made it his priority to protect me, or Jason. That wasn't who he was. We were trained weapons to him.

[There's a lot more that Dick can say here, but he's not sure he wants to start, not sure that Bruce will even hear him. ]