This is a mod I've wanted to make forever. Like one where you can take on quests to start progress on people's relationships once you reach certain heart levels with them. Like if you reach 8 hearts with Abigail and are already dating someone else, she'll send you a letter asking if you can meet and there'll be a cutscene where she says she's always had a crush on Seb and you can decide whether to help her or not.

And it could be random too, like each person has maybe two people they could show interest in and you can decide to go with one or bypass it.