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The original was posted on /r/AmItheAsshole by /u/leviathan_m on 2023-08-05 10:28:29.

For context, I (18 M) have a sister (12 F) who has recently gotten into some trouble. To keep a very long story short, she was caught sending intimate messages and photos to her boyfriend and exes of hers. She has completely lost her phone and any access to it has to be approved by both parents and completely monitored by any of us at all times. Now onto the story:

My dad has a laptop that recently she has figured out the password too. I am a very chill big brother and really don’t mind that she uses it. She’s always around me with it and has never used headphones so I can always hear the contents of what she’s watching. Within the last couple of days, I’ve noticed her becoming increasingly secretive with it. She’ll turn the screen down when I walk past, she’s started wearing headphones, and I’ve heard more silence and typing than I’ve heard TikTok/YouTube. The other day, she was talking to her boyfriend and his friend over video call while I was playing a video game. I’m not sure if she thought I wasn’t paying attention, or if the friend didn’t know I was there, but I heard him say something along the lines of my sister sending her boyfriend something. My sister just responded, “we don’t talk about that.” in a joking fashion. Ever since this conversation, I’ve been very suspicious and have been paying more attention to what she’s doing. Tonight she said her ex-boyfriend said she needed to unblock him because they needed to talk. She refused to tell me who he was, until I forced it out of her, and what they were talking about. When we searched through her phone, we saw that he was one of the people she was sending those messages to. I promised her as some sort of sibling solidarity that I wouldn’t tell our parents that she was using the computer, but now I’m thinking of breaking that promise incase she is doing the same thing again. She has limited access to everything else and this is the only object she has complete, semi-restricted access to. I truly want what’s best for her, but would she see it the same way? Would I ruin any relationship that we have with each other right before I move out if I told our parents?

Would I be the asshole if I broke the promise I made to keep her laptop useage secret, or would I be doing her and our family a favor by removing this outlet? Help me Reddit.

Update: I know this post hasn’t been active very long, but my sister has fallen asleep and I looked through the laptop. I couldn’t find anything with her ex, but I found exactly what I feared with a boy I’ve never even heard of before. It’s all recent (within the last few days), meaning she’s cheating on her boyfriend. Now that I have definitive proof, I no longer have a choice and will be telling my parents. I’m going to try and get some sleep and tell my parents in the morning. Thank you for all your advice. I might provide a second update if anyone cares. I suppose now the question is “aita” but I really don’t care if anyone thinks I am