Betrayed by a slut

Why am I so fucking stupid sometimes huh?! I should have known not to trust a girl with the nickname "Worthless Slut" who begs strangers in a chatroom to degrade her and call her worthless.

This girl was nice to me and when I told her to orgasm because she was asking for it, I came back to check the chatroom half an hour later and she was still begging people "let me orgasm". Okay, so she lied to me. I confront her and she tells me: "If I somehow offended you, block me or whateverrrr". And I said: "No, I just want you to be honest with me, that is all". And before I was going to calmly talk it out and continue to discuss it, she just blocks me, like a freaking bipolar case.

Betrayal hurts, badly.
How the fuck am I supposed to trust people?!