I get that MB. It is especially hard to forgive someone who does not ask for forgiveness, but I've been working on that. I responded to her letter shortly after getting it (and before posting here) and my last paragraph actually mirrors your thoughts:
"It was probably wrong on my part to solicit an apology from someone who isn't genuinely sorry. I will leave it to you to grapple with those demons. I don't want those negative feelings to be part of my life anymore. I've said what I needed to, I know that I have consistently done the right thing, and I forgive you."
____________________________ "In the midst of winter, I found there was, within me, an invincible summer." -- Albert Camus
Me:39 WAW:38 M:9 T:19, No Kids EA/PA with co-worker:9/24/12, ILYBINILWY, S:9/25/12 EA/PA ongoing, MC 9/30/12-present D mediation in progress