Interesting, it honestly never crossed my mind to even tell EXes anything. I suppose the ones that I am still friendly with will find out when other friends at their level of friendship do (I.e. my best friends all already know, but I have friends that I don't have in the loop, but they just aren't as important to me). I do know one thing though, I will offer no apologies to any of them, I always tried my best, and I know it sounds childish, but when relationships have failed it really hasn't been my fault, at least not yet.
Good luck with your letters Padma, I hope that they are understanding and compassionate in their responses.