i can see how that would be annoying. but it is lovely for him to have a proper friend. when my brother was sectioned my mum went in probably every day, and a lot of the other inmates would treat her as their visitor as well, since they had none. the professionals said to her that people who had visitors tended to get better in a way that the ones that didn't didn't, and although my brother had another episode the following year, he has never been hospitalised since. he was VERY lucky, as were we all.