Is a friend’s double standard of being strict with female friends while letting men treat her like trash a valid reason to end the friendship?

I need some honest feedback because this double standard is making me feel completely done with a friendship.

I have a friend who willingly and constantly dumped all of her relationship problems onto me. I never pried into her business, asked for updates, or searched for drama. She voluntarily dumped her problems onto me. Recently, the guy she was seeing completely disrespected her. He called her out of her name, and cut her off twice. Instead of standing in her dignity, she chased after him, tried to explain herself, and kept trying to deal with him.

Meanwhile, she claims she is "very strict" with her female friends. I can just feel deep down that if I were to do even the tiniest thing wrong or need a little space, she would be so quick to cut me off and label me a bad friend.

What bothers me the most is the math: If I treated her even 1% like that guy treated her, she would have dropped me instantly.
She holds me to an impossible standard of perfection while letting a man verbally abuse her and treat her like trash. I feel like my loyalty, confidentiality, and time meant nothing to her because she values a man's disrespect over a friend who actually had her back.

Why are some women so quick to cut off loyal female friends over the smallest things, but give grace after grace to men who treat them like shit?

Am I tripping for wanting to walk away completely, or is this a valid reason to end it?
Is a friend’s double standard of being strict with female friends while letting men treat her like trash a valid reason to end the friendship?
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