My ex and I split up a year ago, we share a 4yo son. Ex is a great dad who sees him every weekend as he works away mon-Fri so usually has him for 2 nights a week. Initially we agreed him giving me £50 a week child maintenance and this worked for a few months but he has taken to withholding the money if we’ve argued or if he’s in a mood etc. He earns good money and always has enough to go to his football and out drinking etc. He says I’m a disgrace for asking for money as when he has him he takes him places, feeds him and sometimes buys him clothes (these stay at his) I pointed out that none of that helps me though… he keeps saying I’m just a money grabber. If I went through CMS I’m sure he’d have to pay more than what I’ve asked for given his wage but I was trying to be decent but so far now since the end of June he’s given me £100 and is refusing to give me anymore. AIBU to go through CMS