What's a good answer to give people who pester you abput being single?

I'm often asked why I'm single and for some reason this year it's bugging me. I'm not sure how to answer. Whether it's part of some guy's way of flirting or a comment made by folks in the community who know me and as that along with "don't you *want* to be happy?" I just shrug. What's a nice short answer that's not rude?

What's a good answer to give people who pester you abput being single?
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