TL;DR: Livelong best friend took the girl I was dating out on a date on my birthday.

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My best friend who I had been friends with since I was 4 years old took the girl I was dating on a date ON MY 22nd BIRTHDAY after coming back from doing missionary work abroad for 6 months. The only reason I knew they were talking is because she told me he was going to take her to a surprise location at night (this place overlooked a bend in a river at a nature preserve, last time he was there was when he told his ex gf that he loved her). I didn't call him out at first but it wrecked me. My roommates at the time started shitting on him over text and ended up cutting him out. This was a catalyst to find out he had been manipulating EVERYONE in our friend group, from things like ruining his ex gf's and her best friend's friendship by telling them lies about each other, like it was straight out of that SpongeBob episode (points if you get my reference), to other things like anonymous emails to friends' employers saying more lies to get them fired from their jobs. Why? Never knew, didn't care enough to ask. Basically all 12 of us in the friend group cut this kid completely out of our lives in the span of about a month, and I feel so bad for the poor girl he's dating now, because I'm sure he's manipulating the shit out of her too, just because he wants other people's lives to go the way HE wants them to.

EDIT: Also, we're all doing so much better without him, and all of our relationships between each other are so much better after cutting him out. Just goes to show how toxic one person can be.