There are hard coded values. One of them is hatefuck. You can change your savefile to another relationship type if you want Virginia back.
Mostly the Virginia comment was in fun. I really am curious about what is what with Rivals though, particularly the ones who are also showing lust. Yes, I know Hatefuck is a thing, but it usually loses it's amusement value after a while. Though I will admit, after certain interactions with Cheerleaders, a part of me is tempted to see if I can't get one of them triple full, but with Dislike, Lust & Romance instead of Friendship, Lust & Romance & just what the hell THAT unholy abomination would look like...