Perhaps grief is like battle: After experiencing enough of it, your body’s instincts take over. When you see it closing in like a Martial death squad, you harden your insides. You prepare for the agony of a shredded heart. And when it hits, it hurts, but not as badly, because you have locked away your weakness, and all that’s left is anger and strength.
It is not the actions of others which trouble us (for those actions are controlled by their governing part), but rather it is our own judgments. Therefore remove those judgments and resolve to let go of your anger, and it will already be gone. How do you let go? By realizing that such actions are not shameful to you.