This married man is frustating me?

So there's a guy I work with who is married and he comes on regular nights out in work. Ever since I met him at one social night he was very nice with me and even came up and hugged me halfway through the night. I have seen him on a few night since and he has been kind and offered me advice and asked me questions about myself. When I told him about my break up he asked me how many guys I slept with since and he seems to want to know how many boyfriends I have or who I am interested in even though I am single or just dating. He has told me personal details about himself and he compliments me a good bit like saying that I was gorgeous looking and funny. I told him that married men are off limits and he agrees with me but his behaviour doesn't change. Why is he behaving like this?

This married man is frustating me?
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