(backstory) One day he tells me of a group chat he is a part of with his other friends and I want to join in; and after some time he lets me in. Most of the people on it are internet trash. After realizing it'd be impossible to be good friends with those people I decided i had enough of them and blocked most of them. I have this other steam friend i've been friends with for much longer than my first mentioned steam friend and as of recently they have been coming onto steam less and less and I've been sort of sad about it whereas before we'd talk often.

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So one day randomly I message my first mentioned friend messages me out of the blue, as normally I'm the one to start talking to him. When I got the notification for a steam message, I was hoping it would be for my better-known friend, but instead I got my other friend. I, (completely feel I was the asshole HERE) went in a small fit of rage in frustration over him not being my better known friend and then shortly realized after I had been an asshole and did a quick apology. I don't normally have stupid tantrums like that but I did. He, in response, tells me he wants to spend a week without talking to me, which I can respect. 3 days later a mutual friend of ours invites me back into the group chat, and I get to read what my friend that Ive known for a year for and his other internet trashy friends that somewhat hate me for being in a fandom.

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Up until this point I've kept my promise of not bothering him, but then I read some of the stuff he said behind my back I had to confront him about it. He said stuff like "EVACUATE" once he saw that I was being re-invited and before that I found he and his friends talked about how I was a loser with no friends except for my "dead" friend and the one mutual friend. I felt the need to confront him about him back talking me and when i did, he didn't respond. I unfriended him on the spot. When he found out I unfriended him, my mutual friend copy pasted his text and sent me him saying "he isn't my problem anymore" as if i was a nuisance. I try using our mutual friend as a courier to relay messages as Ive already unfriended my 1 year long friend and I try telling him "I feel really hurt by your actions" and proceeded to say again "well that isn't my problem anymore, he said he would fuck over anyone who wronged him and he's been wronging me ever since (friend I've known longest) has been taking more absence so why shouldn't I try to fuck him over?" (direct quote). I ask our mutual friend to have my other friend re-add me so he wouldn't have to be a courier anymore, as the mutual friend stated he's felt awkward relaying messages as such. our mutual friend relays, "I really dont want to talk to him, just don't be a messenger. Just tell him I'm done with him and that's that." and that was that. I tried saying to him "I'm done with HIM not the other way around" to keep a sense of dignity. 

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AITA in total?