Something similar happened to me last summer. I was emailing back and forth with him about a possible purchase and then he stopped responding. It's possible that my emails just got lost in the shuffle, but I ended up giving up on it after about a month of no response.

I was really looking forward to acquiring another animal from him. My first experience buying from a breeder had been with him the previous summer and it had gone very well and I was very happy with my purchase. I guess thing just don't work out sometimes.