This is a horrible bug that completely destroys the game for me. I am playing a sweet, cute girl, living alone in her appartment. She dates a lot. Has her jealousy turned off. Only dates girls who are either single or in open relationships. I make sure that all her partners have their jealousy turned off, too. And her partners' partners (if there are any), too.
Silke is super sweet and caring, makes sure to cook and do activities with her partners, gives them friendly advice, asks about their interests. She never makes any promises she might not be able to keep (no promies of eternal love, etc.) She really goes out of her way not to hurt anyone. The green bar is always at least as big as the pink bar. She's never mean or aggressive. She never gets rejected because she's so very sweet and gentle with her approach.
In other words she has super healthy, very caring dating habits. And still she keeps dying from broken heart. Constantly. It makes zero sense. The game is unplayable this way for me, so it seems I have to un-install Lovestruck and start a new game, leaving behind all four households with 23 sims total (the other three households have been started before I bought Lovestruck). Not going to buy any more mods until this bug is fixed, because I am not paying money to have my game ruined.