This is what I want to prevent! I don’t want other woman or men to go through this experience.
So maybe my focus is more on helping those like you mention below. 
For me, I had reposted my wedding dress to sell and he saw my post. I left my fiancé in 2020. This guy was under the impression that I was going through a divorce or something, which I wasn’t. I was just trying to make some cash.
He was feeling lonely himself after his previous girlfriend ran for the hills. He said some very poetic and profoundly beautiful words to me. I decided to meet him for a walk that night. He brought me very thoughtful gifts (sage, sweet grass, cacao, blank canvas, camera tripod and light) based off our brief conversation prior.
I thought, wow that’s so sweet. We stayed up all night talking, well him mostly talking and me listening.
It seemed like he felt he had to do more to earn love.
He wanted validation and to feel needed throughout our relationship. Sometimes he had meltdowns almost like my 3 year old does sometimes.
I wasn’t feeling lonely at the time we met. LBFH was part of my stack at that time.
I did feel like enough in most ways, but was a bit worried about finances.
I didn’t feel like I had to earn his love as I was love bombed to the max.
I was on the brink of leaving my career while dealing with family law court. I had a mess to clean up that way. I didn’t know he was wealthy or so he said he was. He came in to save the day. I became codependent on him financially.
I started questioning several disorders, and found him to be very complex. He openly stated he had complex ptsd and had a history of drug abuse. He said he sometimes got manic if overworking with his trading work.
A lot of lies and confusion.
I still care and want the best for him.
He isn’t a malignant narcissist, but I sense his dad may have been or is that way from conversations shared by his mom.