Ok, I searched in the post but without success...
Is there a way, or a module, to make two npc break up?
Adding the Credible and/or Eris modules to your character will also make the rumor spreading more effective.I don't know if there's a module but in the base game you can do that by going to one of them and spreading bad rumors about their lover and then doing it again for the lover if you're successful eventually they might break up if they end up hating each other enough.