To be fair to Josy. When the girls dump the mc, Josy and the mc's history is they made out once, fucked once, and then ended it. But when the mc ends it in episode 9, it's after leading Josy on for a lot longer, while fucking her and other girls (potentially) left right and centre and then when it's clear she's actually fallen in love with him, he blind sides her with a dumping that she never saw coming.
Her clinginess on the friendship route is kinda evident in that she really, really liked the mc, but sided with Maya's decision to not enter into throuple with him. She wasn't ready to let him go then, but she didn't want to complicate things. But, unfortunately, it is already complicated.
Plus, Maya is being a pain in the ass, and Josy's ready to jump ship, so she kinda keeps checking with the mc to see if maybe they can rekindle things to soften the landing when she bails on Maya.