We met when Z stayed at my place as a paid-guest 2 years ago, Feb 2019. On the night we met, we sat together and talked for 3 hours and became really good friends. Z stayed at my place for 4 days then went on to a sky tour with his family then came back to stay with me 4 more days. I told him that he doesn't have to pay since he is now my friend. We spent the whole time together, eating, drinking, watching, lounging together 24 hours. He lived in Italy so he had to leave although he was on the phone with the airline for 2 hours to change the flight so he could spend more time with me but to no avail. We had sex on the last day. He left some of his belongings in my apt including skis, books and clothes, and told me that he would come back. 
We stayed in touch and talked everyday on whatsapp after he went back to Europe. I have a boyfriend (37M). Z also had a girlfriend back then as well. They broke up a few months later. My bf lives in a different country and we are in a long distance relationship since 2007 (14 years). I have made it very clear how much I love my bf and have no desire at all to break up with my bf. I even had to make a flowchart to explain how much I love my bf and will never break up with my bf when Z complaint and demanded me to tell my bf about me and Z. I cared about Z but never loved him and made this very clear.
In Feb 2020, Z came to my town again to go to the sky tour with his family again. He stayed with me again and we had a great time together for 4 days. Then he left. We had sex a few times. 
In May 2020, Z came back to my town to live with me. It was temp due to his job loss during COVID. I talk to my bf everyday via video chatting. I was hiding the fact that I was living with Z from my bf, but I was not hiding that I was talking to my bf from Z. I did not warn or ask about how Z would have to be quiet or stay out of the view in advance, but I thought it was an unspoken rule. I did not hide Z from my friends though. But he became very unhappy and demanded again how I should confess my relationship with Z to my bf. I did not want to. I did not think Z has any right to ask me this when we were not anything but friends who live together. But I had no plan of being in a relationship with him.
In June, we got into an argument and he said a lot of hurtful things to me about me and my bf , based on false information. He said I was an immoral, manipulative sociopath. 
my bf has been on Tinder and been meeting and talking to other girls. I agreed that he can have sex with other women, and he had sex with other women. But he is not happy with the idea that I would have sex with other men. That is why I did not want to tell him about Z, and that was the reason why Z was not happy with my bf. I have not had sex with other men other than Z, 
He said he was hurt by me and had to endure so many things for me but trying to stay as a good friend for me. He also said if I don't confess now to my bf, soon I will be in a situation where I have to choose between my bf and Z. then he added, "you are not going to choose me anyways." with teary eyes.

Z was never an option to even consider as a romantic partner and I thought I made it clear.

Z always talked about how he doesn't want to be the reason for my relationship breakup. But he would show up at my other friend's birthday party (I organized it in a party room in my condo building) when he was not invited since he doesn't know any of them. Then make it very obvious that we live together upstairs and showing intimacy in front of my friends.

I think (and he told me) he has a few people (both men and women) like me in the different part of the world.

I think he is a narcissistic sociopath... or am I?

What I actually would like to know is: Do you think what I did REALLY hurt Z, or is he just trying to manipulate me to tell my bf about Z and causing the break up?