Friends of 10+ years flame and ditch me over false assumptions

So I have a large group of friends I’ve known longer than 10+ years we all share a YouTube and twitch channel. And of the person I was closest to I decided to have as a roommate. The problem is it was in San Diego California and it was very difficult to find a decent two bedroom apartment for the jobs we were qualified for. And my roommate did not want a construction job my father was offering. He was VERY picky about jobs despite my parents mentioning they’d help with the rent. Eventually he had to move back out because it just didn’t work out.

When he moved out I was able to get a new car and get a job farther than the grocery store I lived next to and it was a really good job. I was also able to pay for my own community college and got a very girlfriend.

After I mention the news about the job I got in my discord, which I mentioned because everyone there talks about good things that happen to them in relation to college, jobs, and vacations so by no means I did not try to come off as bragging, even if I was I don’t think it’s valid to cut off someone you knew of for 10+ years for that. So my ex roommate flames me in the discord chat saying stuff like “wow your father can get you a job but not me when I was over there” I responded “he didn’t? I got the job while my parents were on vacation they had no idea I was even working until they came back” but to no avail he even got angrier because I suppose it made him look silly in the public chat. Reminder: my dad did offer him a job he just didn’t like it or wanted to work in construction.

He then flames me privately on Instagram DMs after I say “I don’t think everyone wants to hear you try to argue with me or make our issues public” along those lines. And he blocks me on everything before I could even respond. He mentions about how I got a free car, free college, free job all form the help of my parents which none of that is true aside from my parents helping me pay for my car insurance for a few months because I didn’t have a job but I was able to pay them for the past year. I also try to tell him if my friends had the same opportunity I would congratulate them rather than flame them. But they blocked me before I could say that.

So after all of that he talks shit behind my back to all my friends about how I know nothing of the real world and how I had everything handed to me and how I didn’t help him when he was here. (I know this bc my other friend told me he said this to them, btw my parents gave him like a few thousand to help him) and I found more apartment listings than he did only a few of them not being compatible which was his excuse. And this teared my relationships apart with most of my friends. Some of them did not care and I hope they are blessed or get good karma because holy shit that is some fucked up shit to say behind someone’s back that you’ve known for 10+ years.

It’s all very cowardly behavior to not speak or ask me about all of this with me before spreading lies or rumors about me. I have partially a video recorded showing evidence about how everything he said was false. And discussing my side of the story. But I’m not sure if it’s the mature thing to do, I don’t really have a platform to defend myself or had the chance to speak about it.

I have only one friend out of the whole group that wanted to privately hear me out. Also he owns the group discord and it has almost 50 people so most people don’t want to challenge him bc he gets very abusive with his power, kicking or deleting messages or taking away roles without any explanation. So that’s probably why my friends are kind of afraid of him.

Any advice or feedback is appreciated.