How should i feel about my childs mother lying about my daughters check?

my x was lying to me about a disability check she was reciving sayin it was for her but it was really for my daughter,she quit her job and decided to live off it for two years ,even while i had the kids for six months spending my money while she wouldnt get them a birthday present or christmas gifts.i footed the load ..we moved in together six months ago and im giving her my half of the rent while she waits on check to pay bills..i feel that she owes me bigtime //im not payin another bill until the lease is up and im takin all the tax money next year