Unfortunately, I think this just happens a lot when you are a female in the dating world. Just reading your story brought back so many memories of times this happened to me. Everything seems to be going along, just dandy, and all of a sudden he stops calling or texting or whatever. It always seemed very abrupt and I always used to worry about what the heck I did to scare them off.

For your own peace of mind, I would stop waiting for him to respond. Treat it as if he lost interest in dating. Better to be pleasantly surprised when he calls you and says that he just had a busy week at work than to be bitterly disappointed after holding onto false hope.