How do your sims react to being unfaithful?

I had one play through with a serial romantic. I had him plan a social event and invited some of his lovers to the party. When one of the girls he was messing around with saw him flirt and kiss another girl, she became sad and when I tried to flirt with her she would reject him every time. Even when it was days after the party, and the relationship wasn't in the red. That was the one and only time I seen that happen. What I recently notice If you do the flirt interaction long enough the offended sim get over it pretty quickly no matter the status of the relationship. I wish EA would tweak it just a little. No matter the status of the relationship they all react the same way. Spouses and girlfriends should have more of a reaction to a cheating partner.

I am really not a of fan of the always sad moodlet when some witness being cheated on. I know being cheated on can make you sad, but it also can make you angry or the want to get even. Hot headed, mean or evil sims should get angry not sad. Adding in the possibly of getting even, would add so much more drama. Having a whim to get caught by the cheater and make them sad, angry or jealous would be awesome. Or the whim to throw a drink on the person he/she is flirting with. Maybe this can be added later?