Why would a girl sleep with my friends to get back at me, but when I brought up her behavior, she acted like I was wrong for bringing it up?

We weren't dating, but she was constantly playing games and being manipulative. She was jealous and would get back at me for (accidentally) making her jealous by sleeping with my friends and then telling me about it.

She wanted to be involved and when I respectfully voiced my concerns about her behavior, she got indignant and acted like I was being disrespectful, mean and crass. She then made a speech about me owing her respect and I MUST treat her like a queen ("how DARE you bring that stuff up... I deserve respect").

Why would a girl have crummy manipulative behavior, and act indignant and prideful if a guy brings up his concerns and reservations?
Why would a girl sleep with my friends to get back at me, but when I brought up her behavior, she acted like I was wrong for bringing it up?
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