Why can't you be happy and content with being single?

Science has proven that it is highly possible to be genuinely happy and content as a single person. So if that is the case why can't you be happy and content with being single, why do you actively try and put effort into finding a partner?

Why cant you be happy and content with being single?
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For everyone who asked me for prove that single people can be happy and content with being single. And there’s so much more evidence online!.
www.happify.com/.../
www.sciencedaily.com/.../150821103644.htm
Why can't you be happy and content with being single?
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