Child support - aibu to ask?

[Afamat]

Hi
Long story short. ExH and I split and originally decided to split time with out DD 50/50. She's 5 but over the last few weeks she isn't wanting to go to her dad's. So we have cut it back to 2 overnight stays a week (if she will go, I'm not going to force her if she doesn't want to). He says nothing has changed at all so doesn't know why she doesn't want to go (although the change happened the same time he got a gf but he's denied that our DD knows etc).
Anyways, he hasn't paid me a penny in the last 6 months and it's starting to annoy me a little. I stayed in the rented family home to give dd some stability during the whole break up and I know that in doing that my monthly bill (not Inc food etc) are at least £250 more than his. So he has all this extra cash and hasn't offered to help me at all.
Aibu to think that now she's with him less, that he was always the bread winner (wanted me to stay home with dd) and his monthly bills have decreased to think that paying something to me for her up keep is appropriate? He spoils her on a weekend, showering her with toys etc but that doesn't help me keep a roof over her head or food in her belly.
Sorry for the rant!

www.gov.uk/child-maintenance

It's possible she doesn't want to go because she knows you are upset about his dereliction of his parental duty. Kids pick up on things not said.

Anyway leaving that aside, he needs to support his child. You should get a formal agreement for the two nights a week because 50/50 doesn't require any support to be paid. Then you should pursue him for the support for the time she's with you.

Thank you for the replies. We haven't got anything in writing legally yet as we are trying to be amicable but the not paying anything is getting a bit much now. Tbh I'm all independent and was thinking I don't want his bloody money to start with but I'm really struggling now financially and wouldn't manage without being loaned a tenner here and there by family and friends.
Suppose I'm most pissed off that he hasn't offered anything, we still get on OK and see eachother a couple of times a week. It seems it hasn't crossed his mind that skint and along as he's treating her to trips out and toys etc (none of which I can afford to do) on a Saturday that that's his contribution.
Will maybe see if I can get some free legal advice.
Thanks.