Random divorce?

This is more of a question, but I didn't see the proper flair for that. My oldest married couple broke up. Nothing too interesting there... or is there?

They had just finished lovin' and the husband just said, "We're not married anymore." That's it. So the ex-wife is understandably pissed, she hates her ex-husband and has a mood debuff. The husband, however, still considers his ex-wife a great person and has zero negative thoughts on this situation.

It's funny, but I guess this means relationship changes are completely random? Like, I've had cheating and breakups before, but generally speaking there was something to prompt it: insult, social fight, another beautiful pawn. Here, nope. He literally just looked over at her and said, "I'm going to sleep in the guest barracks."