This is a pseudo-love triangle story. In fact, there are many reasons why the male and female protagonists cannot be together, but the main reason is that the female protagonist has someone she likes, even if it is just a secret love. It's probably a story where the heroine has a secret crush on a faceless passerby, and the hero loves the heroine openly. Although some people may say that there is no such thing as being straightened! But actually this is my personal experience, don't comment if you don't like it XD - people only like women before they meet the man they like. I don't remember where I heard it from
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