Worst betrayal

What's the worst a friend or a relative has done you? I'll go first. My best friend set me up to be raped at this party we were at.

I might as well give a little backstory. My best friend and I were very close yet we had no mutual friends. It just happened.

So this one time she invited me to this party to meet her friends. I didn't want to but she begged me to. Few hours into the party she called me aside into another room then ran out and locked it

There was another man in the room (he was behind the curtain)

She did admit to doing it, setting me up but her defense was it was not pre-meditated. That it was a decision she was hurriedly pressured to while we were at the party and he promised her he wouldn't do anything with me

So.... what's y'all's worst betrayal story