Why is hitting on a girl considered sexual harassment?

I get how stalking them or sending them unsolicited dick pics can be considered sexual harassment, but hitting on them?
Really?
If you have sex with a woman without her permission, it's rape.
If you ask her if she wants to have sex with you, it sexual harassment?
WTF?
Update: Sorry, I need to clear some things up. The reason I'm asking this is because I'm being accused of sexual harassment by a classmate. I have never asked her out, I have never asked her for sex, I never touched her or attempted to touch her. I have, however, repeatedly hit on her. I also have come up to her... show more Sorry, I need to clear some things up.
The reason I'm asking this is because I'm being accused of sexual harassment by a classmate.
I have never asked her out, I have never asked her for sex, I never touched her or attempted to touch her.

I have, however, repeatedly hit on her. I also have come up to her and said things like, "Heyy, how's it going."

She now thinks I am creepy and she feels "uncomfortable." She has reported me.

Am I sexually harassing her, or is she in the wrong?
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