I think this is also one way to look for it... That means you may don't even trust yourself.... How...Let me tell you some... Someone who love you told you ,..I love you .And you are asking ,....Do you really love me...? ..Because you don't trust yourself and you don't believe on him or her. BUT on otherside when some one tell you I am Upset with you...You never ask...Are you really upset with me....cause you trust and you are so confident as well as you believe he or she really is upset with you ....that's a lack of confident yourself .... FIrst ask your self insid you ,,....I promise you will find the exact answer yourself.