i would say a neutral history, they have been on/off for literal years (in fact, her and naz were basically at war with each other over it for a LONG time) and rebel was always super in love with evan in an obvious way (she's got the regrettes credits and her whole last album's about him) but none of it worked out and now they're more like dramatic best friends who lay on floors and drink alcoholic beverages out of plastic halloween pumpkin themed cups while eating entire oversized bags of peanut m&ms together but basically i think she'd be super friendly with anyone in the band. i know she's done clairo's part in are you bored yet on stage with them a few times, too