What's the most difficult thing you've forgiven?

I won't go into detail because simply thinking of it makes me angry and sick. But forgiving my mother for stealing my Junior year of high school away from me. That's a time that I would do anything to relive. I try not to live with regrets, but that is definitely my biggest. The situation she put me through that year of my life forever changed me. I still have an immense amount of hatred toward her ex-boyfriend which I am still trying to rid of and heal myself from. I will never change myself and let someone control me like my mother did. She was the ONE person I thought was strong enough that it could never happen to and right before my eyes I watched him control her to the point that she felt too weak to even escape the abuse from that psycho bastard. I wish it were all erased. But the good news is, I love my mom the same as I ever did. She is my mother, friend and ultimately my backbone, I couldn't live without her & dread the day I will have to... : (