I'm not going to tell my wife the truth until much later.
What are you going to say?
I'm going to tell her that I'd rather not make a problem out of it at this critical time.
That's good that you want others to be happy. It's nice to want to cheer people up.
It's just that if I make a big deal about what I did, my wife is going to be so upset with me.
I know, but it's best to tell her the truth now and just get it over with. I applaud you not wanting to hurt her feelings, but it's going to come out sooner or later.