Vulnerable

My brother came to me yesterday crying. I was shocked, and I felt so sad. I asked him why? He told me when he 15-17 he played bayside high school. I was like okay? He told me in that game him and other peoples would do adult role plays and they would get out of hand. Like sexual language. So at this point he's crying, I calmed him down and he was like he's going to jail, he destroyed his life. I asked him did you send any photos, or receive any photos he said no, I said did you threaten anyone or stalk or harras anyone he said no. I asked him what's the problem he said he felt bad for being immature and weird on Roblox doing this role play and he said there might have been little children on this game. He said he would always tell his age on Roblox and would only play with kids his age, atleast who told him so. He felt bad he's like iam Jeffery Epstein, Donald trump. He said those players would friend him and they would talk about the game and is scared if he said something inappropriate, he struggles with false memory ocd. I looked at his account and only see messages, but not those ones from those accounts is their anyone way I can bring peace to his mind and find those messages and he's scared what if he gave out details like his social media and what if this haunts him and he's crying all day today saying what if I like children or he's a predator please help.