Worried ...

My ex stopped over this morning and basically told our son that he was not going to be at his game tonight and that he would not be seeing him for awhile. He said he was tired of him coming over and not really spending time with him just watching TV (I know for a fact that this is not true). My poor son thinks it is his fault and thinks that if he had not had me ask his dad to switch days that this would not have happened. I did my best to make him understand that he did nothing wrong and that it was not his fault. His dad is sick and needs help.