Why are women so passive in a relationships while men are expected to be assertive & confident?

Men will have to act and be something forthcoming and honest ask her out "how are you?" you know express their personality their, humor. Like really animate who they are and turn the volume up hopefully, don't lie. Don't be someone who you're not. But you really have to show who you are to get her to respond to something. Women can just stay there, passively choosing and seeing "Well, okay. We'll see. Keep going. Keep impressing me.", you know "Where's this relationship going. Blah blah blah...". This is a woman's passive stance. So a man's always being active. And when the relationship goes sour because she didn't say anything & the man barely understands who she is as a person, she wants to claim all men only want sex or it's the man that was the bad guy & I did nothing wrong.
Why are women so passive in a relationships while men are expected to be assertive & confident?
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