Why do women have such big egos?

Don't be offended this isn't meant to offend. But women EXPECT guys to pursue them. And they'll decide whether the guy has put ENOUGH effort in towards them. Otherwise he's a no go. If that's not enough even if he makes it past that first test he's expected to keep proving himself to her. Why are women like this. Why does ego constantly need to be fed?
Why do women have such big egos?
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