Thats no good... he already takes her teasing as a given, so even when she talks seriously he dont/wont acknowledge. I wont say she wasnt a bit too pushy, but i understand shes trying to give his space but at the same time keep him closer. It also seems like he has bad memories related to money or being take care of because of his family as how angry he got with his mother sending money.
At any case, he really is immature always running away when hes angry. Feels like as long they keep things this uncomplicated and unclear the chances of getting messy are only increasing.