My ex makes it 100% obvious to everyone who knows us that he only takes interest in our children to get to me, he uses them as a reason for me to speak to him and when he had them overnight for the first time he made me promise I was on my own before he let me speak to them. He is a good dad when he is with the kids ,but he up and leaves for weeks and even months every time I knock him back in regards to 'us'. What do I do as I don't feel this is a good thing to raise my children around ??