I'll admit. My very first real boyfriend was a senior when I was a freshman, and his stated reason for breaking up with me was because he would be graduating and he didn't think it would be fair to leave me. Of course, all of two days later, I caught him running the halls with a sophomore. I proceeded to write him a scathing note and stuff it in his locker. Things about lying about his reason for wanting to break up, blah, blah, peppered with a lot of profanity and other not so very nice things.
And yes, the only reason the whole is still memorable after all these years is precisely because I do regret writing the note in that manner with that tone ... not because I was angry he broke up with me (things had more or less run there course), but because although I was justified in my anger because he lied and I should have been less vitriolic about it and pointed it out and then let it go. Now, I'm saddled with the guilt of knowing I wasn't any better about it than he was.
And if I ever ran into someone who knew him, I'd have to sit there day in and out and cringe over it and wonder ...