Lovestruck Relationships Question

Same. I play rotational with seven households total, each gets a whole Sim week. When I returned to my main household yesterday, their romance bar had declined to maybe a fourth - still pink, but it needed a lot of work to fix it. More work than doing the tasks for Grim, actually. 

I had that happen before and figured fiddling with the options might do the trick - turning off jealousy, setting their stance on romantic boundaries to non-negotiable, tweaking likes and dislikes so they perfectly align and so on. But it seems that's only working when I stick with them instead of switching to the next household. I mean, it does make kinda sense that things get a bit rocky if they can't interact for six weeks straight (or longer, if there's a college Sim living on campus), but it's still a nuisance. And the constant fretting about being left alone? That's downright annoying, I mean, romance bar is at a 100 %, romantic satisfaction detto, they're perfectly compatible in a steamy relationship... but they're scared of the other one leaving? SO annoying, and I haven't found a way to fix it yet.