Beating someone who’s worse than you by cheating is the saddest kind of win there is.

The arithmetic of that one is grim from every direction. You already had the advantage, so the cheating added nothing you needed; it just removed the only thing the result could have told you, which is that you are better. The sadness is that you spent something real to buy a fact you already had.

Say nothing to them and something to yourself: play the next one straight, especially against somebody you should beat comfortably. Let the margin be whatever it is. A smaller honest gap tells you more than a bigger invented one.