When we lose confidence in someone it is very difficult to recover it again, that is why we must take great care of the relationship.
In jobs sometimes people do not know how to say "no" and are filled with responsibilities and then can not comply and become irresponsible.
The best thing then is to be sincere from the beginning, because when we know that we can count on the other we always have a feeling of well-being and tranquility.
I wish you that your relationships are always based on trust.
Mine is, I tried hard to build it on trust.