If a guy starts dating his female best friend after getting rejected by another woman which woman is his backup usually?

This guy approached me when he already knew his female friend for about a year. I rejected him and a few months later they are a couple. Did he at the time consider me a plan B or backup for her or was she the consolation prize?

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If a guy starts dating his female best friend after getting rejected by another woman which woman is his backup usually?
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