ThAnKS BrO.
She is though. See their reunion in Maya's bedroom for more info. She's also a straight up moron. Slightly above Arieth in that regard.
Dude, I don't simp either of them, Maya is in the middle of the BaDIK girls list for me, Josy is somewhere at the very bottom next to Tybalt's watermelon, Becky and Madame Rose, so an objective look from the outside:
It is Josy who is the more problematic girl in their relationship, because she is selfish, self-centered, childish, immature spoiled daddy's girl. It is Josy who puts her desire to be with the HOTs when Quinn and her entourage treated Maya badly.
"MUH I AlWaYs WaNtEd tO bE In tHe sOrOrItY HURR DURR" and leaving her girlfriend when she needed moral support. It is Josy who puts herself and her desire to be with Tremolo above everything in the Throuple. It is Josy who is willing to jump on magic cock on the second date, behind Maya's back. And it is Josy who stalks MC and sticks to him no matter what, despite the fact that she is dating Maya.
Maya can be toxic in emotionally unstable moments, and attack as her defensive reaction, but she has self-reflection and admits that she was wrong.
But the main problem in their relationship is that the girls are not very compatible. Maya is an introvert to the core, Josy is her opposite. Maya needs someone to take care of her in a relationship, being cared it's a main trigger for Maya's being emotionally involved with someone no matter the gender. Josy is primarily concerned with herself and only then with Maya.
And what did the reunion show that was toxic on Maya's part? Nothing. The Throuple breakup route in Ep.10 the opposite - showed who's who. Maya will accept your choice, even though it hurts her and says that "We can't be loved by force", for which she growed in my eyes. Meanwhile, Josy tells Sage "If you left him, it wouldn't be enough compared to what he did", openly wishing bad things in return. Sorry, but it's true and nowhere to hide from that facts. Of these two, Josy is the more toxic person.