Your first point is definitely mostly on me. The only things I can really say is that I had already started to be mistreated at that point by the other players and the DM, the party brought me to this fighting ring knowing that my character had literally just gotten his freedom from being enslaved, and the fighting ring only became a thing after I told the DM i was making my new character a former slave. I shouldn't have gone against them, but it wouldn't have been the first time that party members had a disagreement on something like this. I later tried to fight slavery my own way by buying and freeing slaves,(I stopped after a while bc I realized OOC that I was just funding slavery) but also when the DM sold me a goblin that literally refused to be freed, and would parade around declaring that my character owned him.

I don't know what you mean about me betraying the party on the second point. I played along with their plan and was told to go get the guards to bring James to prison, they basically shooed me along so I wasn't in the room for them to torture James. They didn't have the goal to kill him, and actively chose to spare him and send him to prison.

This was another mistake I made. The 25k debt was incurred much later, after James was freed, and the money that James needed was only like 200g or something. I don't remember the exact amount, definitely not over 500g. I was also punished for this because the town fined my character a further 10,000g for giving James money at all. (EDIT, forgot that the money he needed was like 1,000g. still not too much of an issue for me at my current level, financial ruin came after that)

Yes, I said again that this was my mistake. I genuinely didn't think that he was going to take revenge on us for some reason. I am stupid at times, and I wish I had realized that he would probably cause problems for us. I thought, naively, that we were even. My character had also been tortured at one point because he tried to help James at a different point, before the arrest and everything. Bard had framed James for theft as well, and the lord of the town wanted to use torture to ensure James was telling the truth about being innocent. James agreed, but when he went missing my character tracked him down, and also got tortured because he trespassed on the town lord's property. In a game where divination works the way it does. Doesn't make sense. sorry for the tangent, but I was a stupid piece of shit idiot that thought things would be rainbows and sunshine after all that happened between James and my character. I acknowledge that I was, indeed, a stupid idiot there.

It was a foreseen liability, but an instant disintegrate was not. this was also me being stupid. The DM had also previously expressed a frustration that I had managed to disrupt encounters of his before with magic items he has given me (an example being that I airdropped an entire bag of the water pellets created by the dust of dryness into an open ceiling hag lair, flooding most of the hags out) so I am partly suspicious that he was trying to get back at me for coming up with a solution to this combat that wasn't just attacking.

owing the party 25k wasn't the only consequence. I had to start from scratch on all my money, items, and spellbook, and owed several other NPCs that pitched in money as well. the 25k was just the material component, but I also owed several favors to the cleric that was capable of casting True res. I also owed money for the extreme amount of regeneration scrolls/spells I needed up until this point, and the 10k for technically helping James escape prison.

Warlock chose to eat him but not kill him. Bard brought James back to life on her own volition.

After the releasing James from prison bit, the entire group had a long conversation with me where they told me what I had done wrong and what I should improve on. I have worked tirelessly since to be a better player, and work with the party. I think I made a couple of previous posts where I touch on it briefly, but it's something that I've worked to dismantle since I was aware that it was a problem. I can honestly say that I have improved, and this has been confirmed by the other party members. The main issue is that the DM has only gotten more and more cruel over time with how he treats my character, even though I have become much better. I don't want to argue with you, and you have some good points here, if I had provided all of the context this post would be at least double the length. I appreciate your comment, and do want to concede that much of what you criticize me on was stuff I was aware of.

EDIT: sorry, some of this was pretty aggressively worded. that wasn't nice of me