<human>: Can you succinctly summarize the text in 1-3 sentences?

I had a good friend who was obviously interested in me, however I (eventually) made it clear that I just wanted to be friends. Loved the guy to death, he just was not someone I wanted to date. We had been good friends for a little over a year, and then he started seeing someone, which I thought was great for him. I, being the horrible friend, started dating his best friend, behind his back. Trust me a I feel like a horrible person for doing it and I know it was complete betrayal. I never thought I would be the person to do something like that. He obviously found out, disowned me as a friend, and I ended up breaking it off with his best friend. Fast forward a year later. He is still dating the same girl, and we are friendly to each when I see him around town, but by no means are we good friends anymore. 

I honestly think about this whole situation more often then I should, even though its been over a year since. I feel so guilty sometimes it makes me sick. I am thinking about sending him a letter (I live out of state right now) with a sincere apology. I am not looking for forgiveness, I just want him to know I'm genuinely sorry. I feel like this might be a selfish move since it will ultimately make me feel better. Would you want a letter from someone who wronged you like that? Would he even take it seriously, or have I ruined my reputation? What should I do?
<bot>: I slept with a good friend of mine's best friend, knowing said good friend was interested in me. He found out, we aren't friends anymore, its been a year and I want to write him an apology letter. Advice?