I have always got on well with my ex, we had our issues but always but our child first. He has recently become really hostile towards me and and not confirming when he is picking and dropping our child off. We have always had set agreements which we were both happy with for the past 10 years now he's demanding additional night. I said I didn't feel this was the right time to be changing as our child has just returned to school and had some other personal issues going on. He has now threatened not to bring our child home. And looks like he's threatening court actions what can I do?