Why would a guy ask you out if they know you have a bf?

Yeatts
So I am working at a site and a 40-ish old man is fairly friendly with me and I thought he was just being nice so I was nice back.

Later in passing I mentioned I had a bf and he ended the conversation shortly afterwards.

My next shift he started chatting to me and asked if I wanted to go for a coffee on my day off. So I politely declined.

It was really awkward because I have to be polite/nice because he works for the client. So why did he ask me out?
Why would a guy ask you out if they know you have a bf?
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