Relationships and consequences

As someone who enjoys the polyamorous relationship aspect and misses the cheating; I feel like the biggest issue is that the game can't distinguish between "open relationships" and monogamous relationships. Even if they didn't outright acknowledged polyamory, my sims that aren't in committed relationships SHOULDN'T be jealous of their SO/occasional partner flirting/ramboozling with another sim unless they have the jealous trait.

I just feel like there isn't anything distinguishable between traits and relationship types. Sims get jealous/sad if you're flirting with someone else even if you aren't officially dating them, and if you are exclusive they'll barely react at cheating during certain times (although I had one sim go ballistic at a wedding when the groom was caught being flirted with by the ex or something, lmaoooo).

I want my open/non-committal sims to have open, fun, romantic relationships without the drama, but I also want a line distinguished when actual cheating within committed relationship occurs. Sims 3 was a mess because you couldn't DO anything because of the damn reputation system, while here the consequences are far too watered down.