hello!
since the update, my married sims have been autonomously flirting with sims other than their partner. one of these sims has the loyal trait so it was pretty immediately noticed. I started a fresh save with two married sims and they also flirted autonomously outside of the marriage (and were flirted with). unknown if this happens with fiance sims and dating sims.
i don't mind if this happens very occasionally (for the drama, you know) but they're doing it consistently which is a bit of a problem.
thanks,
Art