No one else "makes us angry." We make ourselves angry when we surrender control of our attitude. What someone else may have done is irrelevant. We choose, not they. They merely put our attitude to a test. If we select a volatile attitude by becoming hostile, angry, jealous or suspicious, then we have failed the test. If we condemn ourselves by believing that we are unworthy, then again, we have failed the test.
If we care at all about ourselves, then we must accept full responsibility for our own feelings. We must learn to guard against those feelings that have the capacity to lead our attitude down the wrong path and to strengthen those feelings that can lead us confidently into a better future.
-Jim Rohn, The Five Major Pieces To The Life Puzzle