I was on the phone with my good friend–lets call him Ralph. Ralph got bored and used a bot to track my Telegram account activity. This let him see which channels and groupchats I was in and read every message I had ever sent there. I immeditaely started panicking because i was in a lot of channels and groupchats in which i was texting actively about sensitive and personal topics i didnt want him to know about. He went into one of those chats and started reading my messages aloud. I told him to stop but he kept going. When he reached one particular message and read it out loud to me i hung up–i broke down because i never wanted anyone to find those–especially him. Later he texted saying me he was shocked and sad but on the other day he acted like nothing happened. He even joined one of those groupchats i was in just to mock people there. When I asked why he did this he said that he was “just curious" and laughed. He had always been like this–invasive, cynic and never taking anything seriously–but this made me feel like i cant ignore his behavior anymore. I was angry at him for a really long time and tried to discuss this situation multiple times but he was always tried playing it off and today i finally told him everything i think about this very explicitly. He just said I was making too much of it and that he doesnt want to argue with me. So AITA for blowing up at him or is it really not a big deal?