DS (5yrs old) thinks that everyone is his best friend. He's just started a new school, is in a composite class of primary 1 and 2 yr olds, and has latched onto an older primary 2 boy. He thinks this boy is his best friend but the boy doesn't want to be his friend.
He follows him around every day asking if he can be his friend yet despite the boy telling him no. The boy is now getting annoyed and I think he's realised that DS is quite naive and him and his other older friends have started hitting DS and other things like ganging up and throwing grass at him etc until he gets upset and goes away.
I've tried explaining that the boy doesn't want to be friends with him but DS doesn't understand/believe that and wont leave him alone. He talks about this boy constantly too, how can I stop this before DS gets hurt more?