I have in the passed confessed to lying about a few issues I thought were fairly serious. For example, in college, I was going into education took a class where I was supposed to observe a secondary class with a high minority population and report on the differences. I thought this was troublesome so I just faked the whole situation and wrote the report. This was something like 9-10 years ago.
I noticed, though, in the Catechism, it says:
2487 Every offense committed against justice and truth entails the duty of reparation, even if its author has been forgiven. When it is impossible publicly to make reparation for a wrong, it must be made secretly. If someone who has suffered harm cannot be directly compensated, he must be given moral satisfaction in the name of charity. This duty of reparation also concerns offenses against another’s reputation. This reparation, moral and sometimes material, must be evaluated in terms of the extent of the damage inflicted. It obliges in conscience.
So I am wondering if this means I am required to go back and tell the professor of this class I lied. There are also many other lies I have confessed, to the extent that it would take quite awhile to tell them to the people they involved, most of whom have certainly already forgotten about them; and as far as I know, none of them were ever seriously injured by the lies. Perhaps I am just making excuses, but if this was required, I wish my priest would have told me when I confessed.