Being betrayed is a very painful experience, one that you are not likely to forget for a long time. You can be betrayed by friends, family members, partners in crime, and others. Spouses who are being betrayed may decide to end the relationship, and family members may be shunned if they betray you. Being betrayed can cause a cascade of negative emotions and self doubt. It is important to remember that you are the victim and are not responsible for the actions of others.
Pretending to be happy when you're in pain is just an example of how strong you are as a person.