Mark had a really tough week. I would question anyone's capability to deal with what was thrown at him this week, whether its the truth or not.
For me, Christopher took the opportunity to stick the knife in, which is pretty low given his supposed infatuation with Mark. Kicking someone when they are down is not the persona I would have expected from him given how he has been treated in the past, and from the way he talked previously.
Another hm off my list of good children when it comes to next Christmas