Google Susan Anderson and Journey to Healing from Abandonment. She has a really helpful workbook that discusses the difference and helps you move through the process.
In some ways, what we are experiencing is similar to what family members feel when someone commits suicide...only, in our case, their is often NO closure.
It's very different to grieve when someone CHOOSES to leave you.
Very true, and her book I found very, very helpful.
In the depths of winter, I finally learned that within me there lay an invincible summer. - Albert Camus
Uncertainty is the very condition which impels people to unfold their powers.-Eric Fromm