Why does married friend keep calling me?

I have a male acquaintance whom I've known for 5 years. We are mainly phone friends. What I don't understand is he calls me to just chat, but he is married, freshly married. And all the while he is talking to me he doesn't tell me he is married! I found out through the internet. Now, I'm not going to hook up with him or anything, I just want to know WHY?