DS is 5. He's always preferred to have one best friend (if you can call it that) at a time. He will latch onto someone and pretty much exclude any other child that wants to play or be friends with him.
It's currently been ok because the children he's formed these intense 1 on 1 friendships have reciprocated his interest so my DS remains happy enough.
However, I think it's pretty cruel of him to strike up these friendships and then cast them away when he takes a liking to a different child. His 'best friend' from reception year still chases after him to play with him and my DS very obviously shows him that he's now not interested. I've tried talking to him about it and how it's not kind to ignore people that are trying to be nice and play with him. That it's OK to have a close friend and to still have other children to be friends with. I don't like the idea that he can be mean and exclude children he was once friends with because they're no longer flavour of the month. He will pretty much mug off any other kid that's not his current number one.
I also worry for him. That by only having one friend that other children will soon learn not to bother trying to include him or befriend him because they'll get nothing back from him. I worry that he could potentially isolate himself and end up making himself quite lonely should his one friend decide to drop him. Some irony there considering that's what my DS is happy doing!
I am aware that at 5, friendship groups change rapidly. I just want him to treat others kindly and to not set himself up to potentially not having any friends at all!
Any help or advice? Is it something he will grow out of as he matures emotionally?