How to be freinds with girl went on date with?

How do you stay freinds with a girl you went on a date with then rejected you because she just wants to be freinds which at first I was OK with could always use freinds. Then proceeds to complain about how hard it is to get into a relationship etc... kind of taking it as insulting to an extent

How to be freinds with girl went on date with?
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