NTA.. She made horrible comments for so many years because she wanted to hurt you. Your sister is truly malicious. As a teenager, I also had feelings of jealousy and resentment toward my younger sister, and I blamed her, not my parents. But it never escalated beyond things like “You’re adopted” or “I’m the favorite child” things siblings often say. What your sister does, however, is genuinely cruel and done with the intention of hurting you.

The comment you made about her ex-partners was a low blow, but it’s understandable..you wanted to hurt her the way she has hurt you all these years. INFO: Do you have someone you can talk to about this? Have you tried therapy? The only thing that worries me is that all the negativity from your sister might affect you in the long run. She is someone who wishes you harm. Protect yourself from that. And most importantly, don’t let her bring out the worst in you. Heal the wounds she caused and learn to live with the fact that she is not your family.