How Come Girls Don't Like Nice Guys?

I have heard the saying: "Nice guys finish last". I have seen youtube videos of girls telling guys not to be too nice. Thinking about all the women that I have heard of complain of abuse from boyfriends and husbands, it really makes me wonder why don't they want a nice guy? I have heard of women say that when they are young they want a "bad boy". Then later say, I want a "good guy" to settle down with. This is all very confusing to me.

How Come Girls Don't Like Nice Guys?
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