Covert Narcissist Legal Concerns

My ex is a cover narcissist. I've documented a lot of our relationship and detailing the grooming and eventually emotional/psychological abuse. He weaponized gaslighting/history rewriting/reactive abuse/etc. I got out and had support to help me during the break up and it wasn't until my nervous system calmed down a month later that I realized the patterns and accepted what my best friend and gynecologist told me: he's a covert narcissist.

Back in November I started having weird symptoms (spotting and full on bleeding in between periods and sometimes blood after sex). When I told him, he said "that's weird because Haley (his ex) had the same thing happen to her after sleeping with me". I fawned and brushed it off at the time and said I had a doctor's appointment in May and they couldn't move it up. We broke up in April and when I went to the doctor's appointment I had a complete trauma response because of the emotional abuse being triggered. I was then diagnosed with Mgen. The same day I was diagnosed I saw that he was posted on the Are We Dating the Same Guy Facebook page for Indiana so I knew he was sleeping around with people while having this information.

I waited two days to regulate myself and process the ethical dilemmas involved and decided to post him to protect others, even if it publicly announced me having an STI. I posted the picture he was using for dating apps and his first name and then the following message:

Well i can't post it all but I summarized what he told me about his ex having the same symptoms and not waiting for an all clear from me. I never specifically said he HAD Mgen. I explained that it's not detected on most STI testing and encouraged people to get diagnosed with doctors who check for it during pap smears. I also shared the nature of our relationship in detail staring with the grooming and listing out the narcissistic abuse tactics he utilized on me. I never named his ex.

however, someone shared the post with him and now after a month and a half of him not speaking to me after leaving me in a very destabilizing and unsafe state that he created, he is reaching out and trying to intimidate me. He emailed me "what are you doing?" Then he created a fake number to call me (because he's blocked) and called a couple of times, texted "can we talk" and left a voicemail saying I was "dragging people into this who don't need to be dragged into it" at *:30am on Friday night/Saturday morning. Then yesterday I came home to a handwritten note in my mailbox saying he is going to sue me for defamation

is what i did defamation?