At a guess it is; I can't know for certain because my memory on the exact order of things is fuzzy from tiredness. I was allied to France, and at some point shortly before I quit the game Scotland became France's allies. I also know that close to the point where I quit France broke its alliance with me and dropped to neutral status. IIRC that was the turn after the truce was forced on me.

So I had my war halted for an ally I didn't care much for, and who dumped me immediately anyway to stick close to my enemy. Annoying, highly annoying.