I only remember that the first illusion was something like, "she definitely likes me", and I think its kind of a meme that came out in china a few years ago. I first saw this in the novel Martial Arts Master (and the first illusion again in "I am my wife"), where all 3 illusions are casually brought up by the Mc´s best friend. Other than it being hilarious -imo-, I found it surprisingly wise. Since I just binged the novel to the current chapter and find it a bit tedious to go through it all over again so soon, I´d appreciate it if someone can reply all 3 illusions! P.D. I already tried googling it casually and other stuff comes up.
Happiness D: Seriously tho, as Arashi said i'm preeeetty sure there's no official thing like ''3 illusions'', you might have just read it in a novel. Unless it's some kind of slang or local internet meme (china's got loads of those), which is sounds like from your description, and in that case i wouldnt know ofc, and you prolly wouldnt be able to find it by searching in english, you'd have to search for it in chinese.