My sister (14) who I will refer to as Alex, was adopted by my parents 12 years ago. My parents told me (19 M) and by brother (21) about how she was left under a bridge as a baby in China and the only thing known about her was her birthday. She was taken in an orphanage and named Jade but it was changed by parents when they adopted her, keeping it as her middle name though. My parents told us to not tell her about how she was discovered until they were ready to tell her. My brother was adopted from South Korea with knowlege of who his birth mother was and ways to contact his foster parents through them illegaly storing their email in different items that were given to my parents during adoption. For context, you aren't allowed to leave any contact information when giving a child from fostering to adoption in South Korea. Anyways, when my sister grew up she thought she was going to get to meet her birth parents when she grew up like my brother. It always hurt having to lie about it to her but I knew it would destroy her to know something like that at a young age. A couple days ago, my parents sat down my sister and told her the truth about her parents. According to my parents, "She took it a lot harder than expected." Soon after they told her she called me while I was I eating dinner and my dorm and asked if I knew. I didn't want to lie anymore and told her I knew and that I'm sorry I didn't tell her sooner. She told to burn in hell and hasn't talked to me since. I've beating myself up over this the past couple days about if I should have told her sooner or if I was just trying to protect her. Am I the asshole?