Hi cron65,
I think generally it isn't a good idea. Since you don't know if your ex has been diagnosed by a professional, it's probably best not to speculate to the ex husband.
It is very kind of you to think about the children, you obviously care about them. As you said, it is likely that the ex husband has experienced some of the behaviors that you are thinking about, and has probably come to similar conclusions.
It would be different if he approached you and asked you to share your experiences, but he hasn't, so it's probably best not to involve yourself in their relationship. (Unless you have evidence of dangerous or abusive behavior toward the children)
My 2ยข
