Ruined my stepsister's birthday and got her banned from all clubs in town.
(warning: long story)
BACK STORY: When I was 12, my mom got married to a halfway decent guy. He’s not bad, but he’s not great either, but he made my mom happy and that’s all that I cared about. In fact, I cared so much about her happiness that I was willing to endure 6 years of living under the same roof as his self-obsessed, obnoxious, spoiled daughter, Amy. The entire time we lived together, she would project all of her insecurities onto me in the form of insults. Being young and wildly insecure about myself, these daily insults well and truly cut me to the core and just continued the cycle of crippling insecurity.
When I started “talking to” a boy for the first time, Kyle, she all of a sudden developed an intense infatuation with him and told me I was forbidden from communicating with him from then on. I was insecure but I was not a pushover. When I didn’t listen to her demands, she took it a step further and told Kyle I had ongoing relationships with several other boys (untrue), which he unfortunately believed. I was completely crushed. She then swooped in and took every opportunity to rub it in my face that she “won” him (i.e. inviting him to my birthday parties at home, inviting me out with her only to later reveal I would be thirdwheeling on their date, making him compliment me and then gloating about how she had such a nice boyfriend, etc). This sort of thing happened countless times, not with just boys but with friends and even workplaces! They ended up dating for two years and, although they had a nasty breakup, Kyle and I remained on good terms, which drove her up the wall. She would constantly ask me, “So did you guys hook up behind my back yet?” while claiming to have moved on already.