Neglects his work pretty much on a whim. He didn't know her address, but was about to go to her and take care of her. Their relationship didn't really change that much to grant him this. It went from a kid is hitting on her to a kid she knows and maybe she is sympathetic towards is hitting on her. I guess in his mind it must be something else. Slowly his advances are getting less cute and more intrusive: getting work at her place , which can be excused to some extent since he will learn something maybe mature, getting between her and her ex, now trying to invite himself to her place out of nowhere.