It seems that with instructors I have not trusted them enough to communicate with them. So, if I hold back something, because I do not trust the person . . . the problem is much more than if I lied or not, or if the failure has hurt anyone or not.
And in case you do not trust the instructor, why not? Possibly, we need to trust the person, or it could be the person really is not trustworthy and so God does not have us trust the person.