Girls, have you ever been in a relationship where you were the "side chick," but didn't know you were?

Girls, have you ever been in a relationship where you were the side chick, but didnt know you were?
I HAVE UNKNOWINGLY BEEN A SIDE CHICK.
I HAVE NOT BEEN AN UNKNOWING SIDE CHICK. AT LEAST, I DON'T THINK I HAVE.
SOMETHING ELSE OR NOT SURE.
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Girls, have you ever been in a relationship where you were the "side chick," but didn't know you were?
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