I have asked this question to all lot of my friends to get there opinion on. I have know this guy just to?

speak to. as he comes into my work or i some times dump into him when he is out with his dogs. He used to chat away about wat he has been up to and his dogs., but lately he has gone quiet , but every body else gets a better res ponce from him at my work and just other the last few days ignores me . I would like to know how to get him back speaking to me but iam now a bit wary of him as i don't know if i have done something to upset him .