Whoohoo partners get romance dissatisfaction?

This has to do with the lovestruck romance satisfaction and whoohoo partners. I can't find anything about this so I don't know if this is a bug or a design thing or what, but I have a sim who is whoohoo partners with an NPC (zero romance, friendship and whoohoo only), but the NPC keeps getting "very dissatisfied" romantically, which then causes MY sim to get a fear of loneliness, which is hard to resolve (even harder than usual lol)  since they aren't romantic partners. Is this how it's supposed to work, or should I consider this a bug? Any insight would be appreciated.