Why date someone who doesn’t actively help you grow as a person?

I'm not referring to my other question, that was an extreme case. But I'm curious how literally I should be taking some of the replies.

So I mean this in a general way. Everyone I've ever dated I think would agree with this statement: they made me a little better, I made them a little better, we both maintained our autonomy

Why date someone who doesn’t actively help you grow as a person?
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