When you are in your workplace, you should be able to differentiate your friends from your coworkers.
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Your coworkers and colleagues at your workplace are not your relatives or friends, so don't feel betrayed when they let you down at any point in time. Thinking when being wronged when they betray you make you lack the ability of being responsible for your actions and trying to be sentimental.
The reason why you feel betrayed is because you mistook them for friends when they are not. You confided in them too much and the easily broke that trust because they never took you as their friend. Your coworkers can easily betray you, especially when it comes to climbing a position at the office, they can do anything to win favor from your boss, even if it means tarnishing your image.
You can try to accept this facts or not, you are in a continuous competition with coworkers and colleagues, especially when it comes to work that requires promotion. You can not be an athlete and would want to show the other athlete that you are competing with the secret of your success. Also act like this in your workplace.
Understand this little facts and don't attach too much emotions. Go to work, do your job, be respectful to your boss, be approachable and be cordial to your coworkers, but if you need who to confide in, go home to your families and close friends.
Be clear with your vision and goals at your work place, and there will be surety in your promotion...