I was in a 2 1/2 year relationship with a man similar to the one in that article/blog post. He projected an aura of being a chill, spiritual, pagan, self-aware, confident, pansexual, polyamorous, feminist man. He was tall and handsome, a talented dancer, singer, sculptor and builder of things. I thought I'd found myself a winner!
He was really a man on the autism spectrum, who was also a sociopath, a Don Juan narcissist, a liar, a gaslighter, a user, with no empathy for anyone but himself. He was emotionally isolated, and empty inside, always looking for someone to fill that hole, always looking for that boost to his ego.
He idealised and love bombed me the first year or so of our relationship. He helped me around the house. He took me on dates. He fucked me often and well. He played his guitar and sang to me. He looked deeply into my eyes in a hypnotic fashion.
Then he also seduced my female long term partner. (We had a few lame threeways; he was bad at it. She and I started to figure out his true nature, and she stopped having sex with him.)
When the thrill of "conquering" us had faded, he started to devalue me, and triangulate me with other potential lovers he was pursuing, finally getting himself deeply entangled in a drama-ridden "relationship" with a newly poly MF married couple. Luckily I saw the light as things unfolded and got really weird. I saw how he was now enjoying playing this husband and wife against each other, sewing discord in their own relationship. He told me he liked how complicated it was. He preferred wreaking havoc with them over the type of simple one on one relating he and I had.
The articles at Psychopath Free helped me understand what had happened to me! The only problem is, the articles and the discussion forum assume monogamy. I found it interesting to see the different ways a relationship could be even worse in a "polyamorous" situation such as mine.
https://www.psychopathfree.com/articles/
"Like a black hole, they will suck the energy out of you until you have nothing left to offer, then discard and blame you because the void is still there."