in my short story the antagonist is someone confident and street-smart who is hiding their gambling addiction from a friend staying with them, as they are looking to take advantage of their friend (they pretend they have a job at the casino, etc).
My question is how do I decide how far the antagonist is willing to go? For example, are they stealing just from their friend or also involved in organized crime or in serious debts to loan sharks and so on. I think it would be best for the antagonist to make up with the main character at the end, but I don't want to make them do so much bad that this is impossible.
I also worry that if the antagonist makes too few mistakes, the whole thing will be anti-climactic (it is set in Vegas).
(For more info about the story, see the previous question I asked).