I don't know the story surrounding this "betrayal" you mention, but if the circumstances allow it you may be able to take a more antagonistic route with your former colleagues. Using your character to present IC friction between you and the tribe may be fun for those involved, if that's your sort of thing. Maybe less outright villain and more passive-aggressive disapproval, depending on your relationships.
"I don't want to be known as the guy that just goes up and slaps badonkadonks"
