If a 28-year-old man has never had a girlfriend, does that mean he’s gay?

He is an extremely kind boy, always very respectful and open-minded, with an interest in all sorts of things. Physically, he’s quite a handsome lad, and yet he’s never had a girlfriend. And if the subject of homosexuality comes up, he asks that we don’t bring it up.
If a 28-year-old man has never had a girlfriend, does that mean he’s gay?
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