Just that really.
DS is 5. The background is overly long and more overly uninteresting, but there is a child DS wants to be friends with who isn't interested in DS. I have no strong feelings who DS is friends with, and he has a few other friends, but nearly a year later remains sad that this chap does not want to be friends with him.
Do you just keep sympathising? The topic comes up every few weeks, obviously it's restarted again now school has restarted. I've run out clever or helpful things to say, but I do feel for DS, so I don't want to appear dismissive.