Okay, random Gravity Falls headcanons before I fall asleep:
1. I actually headcanons Wendy to be Aromantic. I mean, she never was really “into” any of the people she dated, even to the point of “oh crap, I never actually broke up with that one guy!”. Her relationship with Robbie was literally him asking and her going “eh, why not?” Because romance is so normalized that she just goes along with it. And you don’t have to be “in love” to have someone break your heart because you thought they actually cared about you.
2. Because of this, if any of her friends fall in love with a supernatural creature that human courts don’t recognize as existing, Wendy and her friend get legally married for tax benefits because tax benefits.