Why guy prefer to be single for life? And how to convince him to date me?

So this guy (40m) say that he want to stay single. So far what I know is that he only dating once 10 years ago for 3 years.

I try to approach and get close to him, but it seems impossible. Like his wall is so tall and thick. How do I approach him and convince him to date me (38f)
Why guy prefer to be single for life? And how to convince him to date me?
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