Well the cheat engine guess may have been a good one. It seems you can edit flags using this table (https://fearlessrevolution.com/viewtopic.php?f=4&t=13996&sid=44a842e8b4f61b632361343ba1cdae6f#google_vignette), including tags like 'isDating'. I don't know if this actually works or not for getting multiple romances, and even if it does it seems like it might be a laborious headache. It's a bit beyond me, but it might be useful to someone.If is just that variable with different values for the state of the romance, it might be fairly easy. Just changing the values for the NPCs when one of them cut the romance, and restoring it to previous values when that conversation is passed.