This passage from the Catechism may be relevant:
1459 Many sins wrong our neighbor. One must do what is possible in order to repair the harm (e.g., return stolen goods, restore the reputation of someone slandered, pay compensation for injuries). Simple justice requires as much. But sin also injures and weakens the sinner himself, as well as his relationships with God and neighbor. Absolution takes away sin, but it does not remedy all the disorders sin has caused. Raised up from sin, the sinner must still recover his full spiritual health by doing something more to make amends for the sin: he must “make satisfaction for” or “expiate” his sins. This satisfaction is also called “penance.”
As MaryT777 wrote in a previous post, you have received absolution, but there is a separate matter of repairing the harm and healing the injury (to yourself and/or others) which your lie has caused. The fact that it still bothers you suggests that some injury remains. Can you heal it by correcting the lie? I am not sure, but you should give it some thought.
It may help to discuss it with a priest, not so much to affirm the absolution of your sin, which we may safely assume is complete, but to seek advice on your options for repairing and healing your relationships.
I have heard that sometimes when we correct a long-standing lie, the results are not as disastrous as we had imagined. The one to whom we lied might say “Aw, forget about it!” or even “I already knew that!”
Even if the response is not so agreeable or forgiving, the correction of a lie may, in the long run, strengthen your relationships with those affected. It demonstrates your intention to be truthful. It demonstrates your strength of character. It may open up your relationships to new, higher levels of honesty and trust.
You said it has “huge potential” to hurt you and your soon-to-be wife. Of course, I don’t know the details and can’t assess the possible harm, but it sounds like you should not do anything rash, and it may be helpful to discuss it in detail with a competent advisor, like a priest, whose independent perspective may offer better guidance than you could possibly get here in the forum.