I Ruined My Best Friend's Life and They Don't Know

I told their employer they were stealing. They were not. I was jealous. They got promoted instead of me, so I sent an anonymous email. They got fired within a week. Their spouse left them. They had a breakdown and spent three months in a facility. When they got out, I was the first person they called. They still call me their best friend. It has been five years. We talk every day. I help them with job applications. I listen to them cry. And every single time, I know I am the reason they are crying.