((((((BobbiJo))))))
This is a tough one. If you really think he might hurt himself, maybe you could call a C or a suicide prevention line for advice on what you should do. Otherwise, I think he is playing you, consciously or not. He knows that you have always put his well being above yours, and he is trying to get things back in order.

That's all I've got.... wish it was more helpful!

Have fun with the cousins!