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The original was posted on /r/nostupidquestions by /u/hot_reasonx on 2023-09-27 14:46:53.
My sister, who has always resented me for being favored by our parents, blew up at me for stealing their attention and making her miserable. Although I understood her frustration, her harsh words hurt. After being forced to apologize by our parents, she sent me a lengthy apology, but it felt insincere. Later, I met a guy named John and we started dating. My sister seemed friendly when I introduced him to my family, but looking back, she was too touchy with him. It turns out she had an affair with him and is now pregnant with his child. I confronted her, and she showed no remorse, only boasting about her relationship with him. As a result, I ended the engagement and kicked him out of our shared apartment. He admitted to the affair but showed no remorse either. I'm devastated and unsure of how to handle the situation.