How was Maya never committed to Josy? She was planning to defy her dad and see Josy in secret at B&R, that was the plan, she still wanted to be with her despite Patrick being a piece of shit. If she wasn't committed, it would've been easy to just reject Josy in Episode 4 and be alone, or try and date MC instead.
Being separated all summer put a huge strain on them, long-distance relationships are tough. That plus Patrick, it's no wonder they both cheated. Maya admitted that they were on the verge of breaking up, and Josy said that she was giving up and going to just run away. I'd put them equally at fault, and insensitive to each other's feelings.