Is it true that there is that one unforgettable girl for boys/guys?

I was told and have heard that guys have that one girl. It's a little hard to explain, but there's that one girl that they will meet and never forget. That one girl that will always mean so much to them and matter to him, even if he doesn't get to be with her. Even if he moves on to someone else, she will Always be remembered by him and have a special spot in his heart. Is this true? If it's true what about that girl makes her be that one girl?

Is it true that there is that one unforgettable girl for boys/guys?
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