If your boyfriend invites you over to his house, he should be the one spending time with you, not his sister. So I don't think you're overreacting at all. In fact, I think your boyfriend is being rather selfish and immature. I mean seriously, he goes off and plays on his PlayStation? If he isn't willing to talk to you or listen to you about this, then you need to get his priorities straight or just break up with him. It is not all right for him to treat you like his sister's babysitter while he goes off doing something else.
