Don’t. Just Don’t.

Sorry doesn't cut it. Sorry doesn't change the fact that you've ruined my little sister's life and led her to have eating disorders and become overly self-conscious just so she'd be "pretty enough" for you. Perhaps saying "I'm sorry" makes you feel better, lessens your guilt, but honestly, it does not, in any way whatsoever, show that you feel remorse for what you did to her.

Saying that you're sorry is empty. Don't carelessly throw it about. It doesn't show that you mean it, that you genuinely feel apologetic and care about my sister.

You hurt her. After all she's done for you, how much she loved you, you just pretended to care for her, before you cheated on her and broke her heart. Listen, you jerk. Don't tell her you're sorry. It means nothing. 

Maybe it's worked for you before. Maybe every time, after you told a girl that you're sorry for hurting them, they believed you, and everything became alright, no matter how bad the situation. Guess what? It's different this time. I don't give a damn how many times you say you're sorry. Empty words that mean absolutely nothing.

Tomorrow, I'm going to find you at school, and slap you. Don't worry, after that, I'll say I'm sorry. Then I'll slap you again. And again. But at least I'd have said sorry, right?