[He's not upset yet and that's a good sign. It doesn't make Damian feel any better about never having disclosed the information to him while they'd been in Haven considering Grayson's confusion and probable frustration with Bruce's lack of memories, but it does make some of his tension drop away.]

He mentioned having met Kyle already. Others too, like Gordon. People he shouldn't have met—didn't meet in our universe until he was already wearing the cowl. [So when Damian said 'possibly not their Bruce' what he meant was '100% without a doubt not their Bruce.']

I found out shortly before we left Haven behind and I never found a way to bring it up. [With anyone.]