Please be gentle with me - I'm a bit shaken by confrontation with ex!
Long story short - I live alone with 21m old DD, ex lives with his parents, has no outgoings and pays as little child support as he can get away with.
When I weaned DD, I tried to give her organic, healthy food, the best I could afford. Now she is older and eats considerably more (and the same food as me) I've not been able to afford to feed her organic food, but she does have 3 healthy, home-cooked meals every day. Me and DD eat the same meals, together at the table. I have a strict food shopping budget, I do struggle to make ends meet sometimes.
Unknown to me, my dad spoke to ex, and suggested that, while he has no outgoings, he might provide a little more money for his daughter, to make sure she has the quality of life he wants her to have. Ex is not short of a bob or two, and regularly boasts to me about his latest expensive purchase.
Ex comes to me, saying he wouldn't contribute another penny, and if I was struggling it was 'my fault', I 'deserved it' and if I wanted better for DD I would have to make my own cuts. I have nothing left to cut, I don't buy myself clothes, or DVDs/CDs/books/games. Things I do have I sell to make ends meet.
Ex expressed his dissapointment that I was no longer feeding DD organic food, stated that it was the best for her, and if I really wanted her to have the best I would go without, or have cheaper food myself (he gave beans on toast as an example) so that DD could have organic. He also suggested that Slimfast shakes would work out cheaper than a portion of food for myself, and if I cared about DD I would have those and spend the money I saved on food for her.
The way he puts things makes me head spin - and leaves me not knowing whether I'm wrong or right, and now I just feel like a selfish, greedy mother 
AIBU? Or was he? 