So the protagonist wasn't actually betrayed but rather fired from his job and used by a gold digger who was too retarded to understand that giving advice that gets your boyfriend fired from his job means that he won't give you shit for free anymore. The former happened because his ambitions didn't suit his team and the latter happened because he was a simp.
The dragon girl's comrades are too retarded to understand that healing their vanguard is far more efficient and less criminal than tricking a different person into being your team's meatshield every time you've got to run through a dungeon...
The cleric got taken down by a preteen angry that her crush wouldn't respond to her advances, and the mage used to be the villainess of an otome game.
It doesn't really make sense, but there are no happy accidents. Only mistakes.
Thank you, Rob Boss.
edit: bro that's not a shortsword that's literally a knife