Because, tpen. When dealing with an A, they do NOT process anything rational, or normal, like you or me.
They must numb their pain. Lucky us, we get to feel everything. We don't have to numb it, and we don't have the luxury of moving on without feelings. I consider myself very lucky that I have the capacity to feel, love and be in pain. It means that I will heal, and move on to bigger, better things!
So will you!