Battle for the Cowl #3. It's been posted if you go through the Jason Todd tags.
Basically Bruce left a message for all the boys. Jason heard his in private. Dick replays his message in front of him to get him to "listen" to it again. Basically Bruce says (paraphrasing here): "That secret no one knows about, I know of an excellent therapist who you should go see..."
And Jason freaks out, says, "I heard it before. Enough!" And goes ballistic on Dick.
Just.... bad all around. As if the guy hasn't been through enough there's gotta be this potential horrific secret?