Advice on how to handle this please? ExH has contact with DS(3.7) for one afternoon every couple of weeks or so.
He is archetypal Disney dad, only wants DS is he doesn't have any other plans, needs to show him off to someone etc.
Divorce is going pretty amicably, everything agreed and I have been absolutely careful about not saying in front of DS.
I try to keep everything breezy, but ExH has a habit of not keeping promises, turning up late or not at all -this is a hot button for me,which is why he does it - and I struggle with seeing DS get upset.
He is the kind of child who likes to know the plan, "who is picking me up tonight?", "what time is XX coming?" etc so no pulling the wool over his eyes.
The last contact visit there were tears, "i don't like Daddy", "i'm shy", "I will miss you Mummy", and "who will cuddle me when I am with Daddy?" 
He is fine with CM, nursery, other relatives etc. He was fine again at drop off but this morning he has started this again.
I don't want to be too reassuring IFYSWIM, as then if DS's Dad does let him down, he will also think I lied to him read that in a parenting book but also I can't make his dad be more affectionate with him tried that before we split up
How do I handle this please?