Well, yeah?
You took the piss completely out of his generosity when he was paying you several hundreds every month, entirely voluntary as 50/50 and you tried to open a case to get even more. Of course he had to stop your greedy attempt. How dare you, frankly.
Then, he gave you a hundred opportunities (more than you deserved after the way you'd behaved) to address your own behaviour. But no, you kept on with your ridiculous "I believe myself to be right" greed.
He's done NOTHING wrong and been far more accommodating most people would have been. He hasn't turned the children against you, he's just told them what you did and they've formed the same opinion as the hundreds of people who told you how unacceptable and taking the piss your behaviour is.
Your choices and your consequences. He's done nothing and you can't beat to admit, even now, your greedy caused the whole situation.