Did he lose interest?

This guy always waves at me and talks to me. Couple days he asked for my number but I didn't give it to him. Then he asked me if I'll think about it and I said okay. After a week that I saw him he seems to be ignoring me. Today I saw him he drove past me he just gaved me a look and went his business. He didn't even wave nothing. Why is he acting like that? Did he lose interest? Or found someone else?
Did he lose interest?
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