The bitter taste of regret taste rather sweet on my tongue

The world is, at some point, the enemy, but you know what they say. Keep your friends close and your enemies closer. Therefor, I am going to be nice to everyone, and kill 'em with kindness. I suggest doing the same. Oh, and I found out today just how heartless even the kindest of people can be. The girl who we shall call "Ky". She's beginnig to flirt with my friend as if it's okay. You know, I'm not a vengful person, but that's LOW. Like, below the belt. But I know what I'm going to do. Show Her what she had in her hands, and how much of a mistake she made. This is what traitors of hearts get: "the bitter taste of regret."