That's tricky. It could be anything but 4 days is a long time to be completely out of touch. If you don't know anyone else who knows him too, then all you can do is wait. (Not sure if this is true for your case, but saying big words are quite meaningless ....so fighter he may have been initially, but that sometimes could be a challenge to win you over. Sad but happens to too many people. )
why waste time with games?
I would cease contact. now.