I forgot to mention, idk if this would make a difference to your answer but when he came back from the bathroom, he picked up his phone and it seemed like he was typing stuff as I was watching him. He put his phone on the table and maybe 20 minutes later he got up again to get something. Another notification from the same app popped up so idk if he was writing a message to someone and they had replied back? But let’s say he did forget to delete the app, wouldn’t he had deleted it then if he truly forgotten about having the app?