The family court system is unfair to men?

Why I say that is because my ex wife or the devil which I now call her Committed adultery left for four months then seen their was money to be made off the kids I pay 857.00 for her to keep my two boys for 14 days a month plus pay insurance prem's and 75% of the co pay and anything the insurance doesn't cover. Where the fairness in that the system needs changed.