My son recently had a party for his 7th birthday to which he invited 15 boys out of his class.
He told me at the time that he only wanted to invite the boys out of his class and not any girls I just went along with this and with 15 invites sent out felt that was enough anyway.
Recently a girl in his class has just had her party and invited the whole class except my ds.
My son didn't get a invite and I suspect its because she wasn;t invited to his. It wouldn't be because they don't get on or anything as I know they do, I have seen them play together and I have spoken to her mom on the odd occasion.
I realise how I probably sound but I just feel its a bit petty what do others think.