Ex didn’t pay me because he was paying for his love child behind me back!

Here goes!!

Well I’ve been split with my ex for 5 years and not claimed child support as he told me he really couldn’t afford it as his bills were too much etc.. anyway I gave him the benefit of the doubt and brought them up by myself with my own money.

Recently I’ve found it a struggle raising teenagers and paying my bills etc so decided I’d claim csa as he point blank refused to help me in anyway.

Whilst on the phone claiming csa the lady on the phone informed me he was already paying csa to another child…..

well this child turns out to be my old babysitters daughter that he fathered behind my back in 2007-8!

Where the hell do i stand on back pay and splitting maintanaince, I didn’t claim over 5 years ago as he told me he would struggle but then I find out this tart has been getting money from him and I’ve gone without?

He only has his 2 girls once a fortnight they are 12 & 9 years old his other child is 8 years old she got pregnant just after I gave birth to his other daughter.