I have no advice, just lots of empathy. When I went to see my divorce lawyer, she told me that the number of fathers that drop contact with their children completely after 2 years of the adult's relationship failing was phenomenal. My X is utterly crap too. Well, he calls them quite often as and when he feels like it, but is unable to have a proper conversation with them on the phone, he has no idea what they get up to and doesn't ask, and lies to them. It is as if they are there for his entertainment.
Frequently he will promise them to visit or he will promise them he will 'talk to me' about seeing them, and I never hear a word. I don't know if he is in denial or is just a total lying shit. I think he is feeding lots of lies to his parents too, as his mum texted me to ask if he could talk to the children... (he is in his 30s), obviously in their eyes I am keeping him away from his darling children.
But the children think he walks on water. The man who hasn't bothered to see his young children for over 12 weeks now.
I think as a mother, it is a lose-lose situation. You try and boundary their father's behaviour and it will come back to bite you, you let him do what he wants for the best of the children and it will come back to bite you. It is heart breaking.
But I do try and be honest with the children, as much as I can, with as positive a spin as I can put to it. Their father has issues with mental health and alcohol, so I tell them that he loves them very much but to remember that he is ill and therefore that is why he is not able to see them as much as he would want to. I am adamant that a) they will not grow up thinking it is my fault, and more importantly b) that they do absolutely not think it is their fault. Although he keeps telling him he is all well again..... uh huh, that is why he just lost another job then.......
.