”Do not trust in a neighbor; put no confidence in a friend. Even with her who lies in your embrace be careful of your words.” - Micah 7:5 (NIV)
"Be courteous to all, but intimate with few, and let those few be well tried before you give them your confidence." - George Washington
We are all fallible and capricious creatures - bound by moods, selfishness, pettiness, jealousy and insecurity...
So do not be astound when you are betrayed by your colleague, neighbor, friend or even your family...