Why would a guy keep sharing his personal life with me when I've been clearly showing him that I want to keep things professional between us?

So he flirts with me, gets touchy, stares at me a lot, gets jealous when other guys talk to me etc. and he keeps sharing his personal life with me even though we're not friends and I never ever ask him any personal questions. He also asks me a lot of personal questions about my life like about my likes dislikes, where I've studied what I've studied where I live etc.

For eg: Today he we had a conversation in the afternoon which was a professional one and he told me he would be late to the office cause someone had borrowed his car and got into an accident which damaged his car but the person was fine I was like ok.

When he came to the office, a little while later he came to show me multiple pics of his car and what damage it took. Other than me, I only saw him showing those pics to his best friend at the office.

Why would a guy keep sharing his personal life with me when I've been clearly showing him that I want to keep things professional between us?
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