What's the worst breakup you have ever been through?

I was 18 and he was 17. We'd been together about six months. We were both pretty toxic and manipulative in all honesty. I'd cheated on him once but we forgave each other. A while later, I threatened to do it again if he didn't start treating me better. He said that if I cheated on him again, he'd kill himself. I stormed out. I went to his best friend's house. We slept together, and I sent my bf a snapchat of his friend inside me. Had to turn my phone off cos he kept trying to call me and it was ruining the mood. The next day, I got a call from his dad saying that he'd hung himself overnight. It was heartbreaking at first but me and his best friend were there for each other and ended up getting together and even seeing the funny side of the situation