AITA for not forgiving my sister for sleeping with my boyfriend after he made her sick?

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I never imagined that betrayal could come from someone I loved and trusted with every fiber of my being, someone whose face I grew up with, whose laughter I knew like my own. My sister, Milly, and I shared a bond I thought was unbreakable, a connection deeper than friendship, a blood tie that I believed would always keep us safe from the cruelty of the world. But when I discovered that she had slept with Cole, the boy I had loved for years, that illusion of safety shattered completely. It wasn’t just a betrayal of romantic trust; it was a violation of family, of loyalty, and of everything I held sacred. The revelation left me numb, angry, and disoriented, realizing that the people I thought would protect me had instead become the architects of my heartbreak. In that instant, the lines between love and deceit blurred into a painful, unforgiving reality.

When The Person I Trusted Most, My Own Sister, Became The Face Of Betrayal And Shattered Every Sense Of Home I Ever Knew

She Didn’t Cry, Didn’t Beg, Didn’t Show A Single Shred Of Remorse, And That Cold Silence Spoke Louder Than Any Apology Could Have

Learning That He Had Cheated With Others Too, Realizing That The Damage Wasn’t Just Emotional, But A Tangible, Lingering Sickness That Could Have Been Avoided

My Sister, The Person I Trusted With My Blood, Became His Next Victim, And Karma Struck With A Cruel Irony That Left Her Wounded And Me Irrevocably Angry

Now She Cries Not For The Pain She Caused Me, But For The Life She Lost Because Of The Man She Chose Over Her Own Brother, And I Cannot Sympathize

The Family Who Tells Me To Forgive Forgets That I Was The First Victim, And That Their Advice Feels Like A Betrayal In Itself

Let’s hear the community’s take on this wild story.

Even now, years later, the sting of that betrayal lingers like an unhealed wound, and the memory of their actions is seared into my mind. I cannot erase the anger, nor the deep sense of loss I felt when the people I trusted most, Cole and my sister, turned my world upside down. Forgiveness feels impossible, not because I am cruel, but because the damage was profound, irreversible, and rooted in choices that showed a lack of remorse or understanding. Family is supposed to be a sanctuary, yet I was left to navigate the fallout alone, shielded only by the support of my parents. And while some insist I should forgive, I know that to do so would betray my own boundaries and invalidate the gravity of their actions. I survived, I grew, and I moved forward, but I will never forget what it meant to be betrayed by the two people I should have been able to trust the most.

How did this make you feel?

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