Feelings of exclusion, distrust, betrayal and disappointment all wind-up leaving us hurt which can cause us lose a proper perspective of reality. This loss of focus is often due to a negative mind set of ourselves and everyone involved. The key to being an overcomer is being able to free our minds in forgiving ourselves and those involved.
Although difficult, look for opportunities in the mist of the hurt to become more self-aware. Healing can come when you are honest with your suppressed and unexpressed emotions. This doesn't mean that you freely let them loose but it means you are working on mastering root causes and not surface issues of hurt. You are the only one that can control you. Don't let outside forces cause you to be unproductive.