The advice is almost always well-meaning, but it’s completely clueless.
“Come on,” the advice goes. “That happened a long time ago. He didn’t really mean to hurt you. They did the best they could. You just need to let it go. It’s time to get over it.”
I know what it feels like to think this about someone, because I’ve done it, too. I remember a conversation I had years ago in which a friend and I mocked someone who couldn’t “get over it” and move on after childhood abuse. That was before I understood my own childhood trauma, so I eventually felt guilty about having said such things about someone else.
But I get it. When you watch someone else go through the agony of long-term pain and anger from emotional abuse, it’s baffling if you don’t have a frame of reference. The person who’s suffered abuse can come across as crazy — at least it can look that way to someone who’s not hurting.

Shame almost got me fired — and shame still haunts me years later
UPDATE: No, I really haven’t died; I’ve just lost my sense of purpose
Dead man’s watch always there to remind me of my own mortality
Happiness and success elude me unless I’m doing something I love
Fear of possible violence keeps some people trapped by misery
Sex is everywhere in our culture, but we’re starved for intimacy
‘We’re live with people standing in line. Did we mention we’re live?’
Competent, beautiful girl mirrors what I’d love to have in daughter