The good news is, you decide how to react, you choose how to respond to any given situation or person. No one can make you angry, sad or frustrated unless you let them.
The bad news is, it is pretty darn hard to remember you are answerable to your own behaviour no matter what the circumstances or pain inflicted and only you can be held accountable for your actions, beliefs and words, even if you really want to retaliate, resent or wreak havoc.