Lord John Grey had a bit of a breakdown in Outlander season 7, episode 12—and it’s about time. For as long as Jamie has known him, lord John has always been highly proper. His honor is extremely important to him, and he cares for and assists those he cares about in any way he can, regardless of the negative consequences he himself faces. This continued into Outlander season 7 when Lord John married Claire Fraser to protect her from being hanged as a spy. It was an incredibly selfless move, but he hasn’t been very well rewarded for it.
https://screenrant.com/outlander-season-7-lord-john-grey-breakdown-necessary-op-ed/