i have all the expansion packs except bussiness and hobbies, and I tried the villainous valentine aspiration. But when I cheated on my husband in front of him there was no reaction or mood buffs or anything, like nothing happened. So now I can't finish the aspiration :(
Reactions to cheating can be a bit jank, I had my couple set up to be jealous of everything, flirting, kissing etc but I'd say 60% of the time they didn't care. Then I changed it to only being jealous of whoohoo and then one day my female sim kissed her husband's brother and all hell broke loose ended up with her husband dying of anger and jealousy on the bathroom floor :/
I don't own lovestruck so I can't say how that effects things but base game it's only a chance they'll react or not react to cheating, not a definite. Still trying to figure this out myself.
Does your sim happen to have the player trait (reward trait for finishing the serial tomantic aspiration)? Because sims with that trait will never cause jealousy.
