Dating a psychopath. How can I let him know that he needs to take therapy, at least for workplace?

We were childhood sweethearts. He would follow me around then. Growing up, after my serious relationship, I went to him coz I was lonely in college and needed a good friend. Soon it became a toxic cycle.

He flourished on my consent. He wants me to be agreeable. Like he wants me to agree to eat cheese but don't buy. Similarly he wants me to meet him but doesn't turn up, He wants us to have sex but doesn't do the deed. Moreover he seeks proof. Proof of me being faithful to him or going to the place where he wants to meet me. He always doubts if Im cheating on him. While all this is true, we were never in a relationship.

Neither does he talk to me much, until he fears loosing me. Disrespect is extreme. Consent for sex was on his terms and never on mine. My values and feelings were unappreciated.

So I tried talking to his friends who seem to have no idea about his parents, home or anyone there. He is introvert, yet people who visit him at house has no idea about his past. Somewhere when I try to connect he would say 'I don't remember' to evade. Looks a ghost identity.

I left him, to meet with cold response. He would try his best to break the dates, if that was with common friends. When I hooked up, he lost temper and was yelling at me for days. we were at movies by accident, sitting next to each other like strangers. But definitely can feel intense anger and rage. Also recently, he turns off read receipts, only to me and turns one when I ghost.

Nobody seems to understand me when I say he is toxic to an extend coz for all, he is a very sweet guy. Also they all believe in his extensive lies purely.

We are colleagues. Others seem to hate him. Somewhere they all don't hang out with him or talk. They find him slightly different and don't want to be around. His promotion is on hold coz of behaviour and poor peer rating.

But I do see him looking at me all the time and they all suspect something between us.

How to ask to seek therapy at least for workplace?

Dating a psychopath. How can I let him know that he needs to take therapy, at least for workplace?
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