Has anyone had this issue?

Yes, that doesn’t rule out him meaning it being random though ;) It could be just using the word ‘deciding’ in an ironical way. Like one could say: and then my car decided to go ice skating this morning. And let’s be honest, most simmers see their virtual dolls as actual human beings with a mind of their own, that’s part of the charm. In relation to the topic, I often see the question here: do you decide your sim’s spouse or do you let them decide themselves? I really think the ‘letting the sim decide’ is based on what happens in your own brain or what happens coincidently on your screen as well.