That is very true dear friend! On issues of trust the example is perfect, you may do many good things and make a simple mistake without guilt. Even so you will be judged by that same mistake even if it was without any intention, here we enter the subject of knowing how to apologize and know how to forgive.
Seeing it from both sides of the coin.
On the other hand, there is always some act or something for which we torment the past, the past is present and generates depression ... Some bad decision, lose a person. The first thing we must do is accept it and stop looking for the subject matter, things happen for a reason.