But if you've been walking the same path with someone for a certain amount of time (say, 10 years), and everything seemed to be fine, and no one was putting each other in a position to make a choice, etc., but one day your friend takes a path that you find repulsive and that you will never support. And you have a choice: continue on (betraying yourself) or betray your friend.
So, which of these two options is a betrayal?