I get where you're coming from though. Just yesterday I found myself thinking about some medical advice my ex needs. Information that I have (am expert in!) but that he just wouldn't hear from me when we were married (because he was so busy trying to find reasons to make his leaving be my fault, he couldn't possibly take my advice on anything).
Some days I find myself thinking, well maybe now he'd listen to me, since we've been broken up for over 3 years and he's now engaged to his new young fiancee. Even though he was a [censored] to me,(and I don't want him back, no,no,no) I still worry about his health. I guess we are lucky that we have that ability.