It’s only fair. He has clearly demonstrated that he knows much more about her than she does of him.

“I was vassal to someone in a high position within Faerghan society. I swore an oath to protect them from harm.” There’s still a look of determination on his face as he says it. Dedue may no longer be Dimitri’s vassal, but he still strongly believes in that goal.

He then adds, “It was something I chose to do, and yet I also had little choice at the time. The friendship we had shared before this became strained as a result. It would take a good deal of time to work through.”

This is not something he would tell most people on the first day, but he knows Eleanor and imagines she may relate to some of it.