Ex left when DC was a couple of months old, had no financial support or anything at all from him for almost two years.
He then came back, I genuinely thought he’d changed. He seemed to genuinely realise what a mistake he had made, and he’s been consistent since then, which was several years ago.
Now he’s fucked off again. He hasn’t even bothered saying goodbye to DC or making any arrangements at all regarding finances. Ignoring my calls and texts - totally out of the blue and unprovoked, after being very involved with DC and seeing them multiple times each week.
I’m so heartbroken for DC. What do I tell them 
I can’t eat or sleep because I’m so stressed out.