Jean raises his hand to put on top of Marco's. Mostly for his own comfort, but also as a gesture that he appreciates it.

"I mean, I know it's not my fault it happened. I do wonder if I need to work on my mental strength or something, but even then it could have happened, you know?"

It's not an actual answer to exactly how he's doing, but probably tells a lot about how much he's been thinking about it.