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.

Youth and death are bookends pointing toward truth between
If romantic love is mental illness, do many of us want to be cured?
The biggest question a human faces is how to live a good life
Apologize while you still can, because you’ll live with regret
It might not matter who’s right; just fix the problem and move on
The more I see of death, the more determined I am to live life fully
We’re all prisoners of a culture which demands that we conform