I receive £503 a month maintenance from ex for our 3 dc, this is the calculation made by the cms. He has just had a new baby with his partner and has asked if we can come to an agreement to lower the payment, he wants to lower it by £150 so he can provide for his new child, we get on reasonably well so I think he thought I would agree to this, I haven't and it's not to be spiteful I understand his new child needs to be provided for but I can't afford to accept less, well he's turned nasty and when he dropped dcs off from the last contact he said if I didn't agree then his partner was going to put in a claim to the cms for their child and I will stand to lose about £150 anyway... Will I really lose that amount if they do that? Should I just agree to keep the peace if it's inevitable?