The sim I was playing had (past tense) a girlfriend who he caught cheating on him. He had those bright red Angry emotions for a few days, and a long-term memory of the event. The girlfriend had nothing, she was obviously unaware that my sim had seen her. I immediately started ignoring her calls, and if she visited I'd just leave her at the door waiting.
I edited her likes and dislikes to hate fitness, and changed her "Active" trait to "Slob". I would send sims over to her house and force feed her Lobster Thermidor. She swelled up like a balloon. My original sim befriended and married one of her house mates, and they now have a son.
I don't kill off disliked sims, but I do prank them and they serve a purpose as the butt of jokes.
