I canceled on the biweekly DnD session because it was scheduled for Halloween and I had plans. Told him a little last minute (day before when I realized).
Was that this year? Halloween wasn't too long ago, maybe he was in a bad mood/unstable situation. You may recover if he reconsiders, it feels a bit extreme to burn a decade old bridge just because of that
Not really? It was his first time DMing. He was doing a homebrew story. Actually Foundry, not DnD. It was my first time playing and I was really struggling with it. I wasn't a fan of where the party was taking it and each session was basically wandering aimlessly through a cave and repeating my only attack (sling a rock) at whatever monsters we found. I let him know that I wasn't enjoying it and there wasn't a lot for my character to do and he just linked me to the rules website.
I asked for advice on Lemmy, and they suggested I ask for like a 15 minute out of character period at the start of next session to express what our goals were in the game. That was scheduled for the session that I ultimately bailed on.
I got a long string of texts the next morning about how I don't respect him and never respected him and a lot of other shit. I dunno.
It seems that in the past he felt bad about something you did to him, he give you another chance and you did the thing about cancelling at the last moment. So the real issue was the previous one, nor the latter (the one you said at the beginning)
Agree with other responder. End of October was.. Stressful. Way more for some than others. This might be one of those situations where trying an "Are you OK?" would be all that's needed to start mending.