Definitions are useful.
This is you EX. This person is OUT of YOUR LIFE. Out. So why does the mere mention of his/her name set you off into hysteria?
When you have an Ex this means it is all over.
You have moved on. Focus on the fact you Moved On. No need to rehash, relive or repeat. We all know all the details already.
It is like a T.V. show that went off the air. Why are you discussing it?
It is Over. It is Done.
Shut the T.V. and move on.