I told you so
I warned you in advance, especially of a bad outcome. For example, It's too bad your guests didn't get along with each other, but remember, I told you so.
Examples from the Web for i told you so
That sort of I-told-you-so look that makes you wish you were big enough to lick him.The Rushton Boys at Rally Hall|Spencer Davenport
His glance on its way back to the judge met that of Blodgett, which had both a warning and an "I-told-you-so" quality in it.Lightnin'|Frank Bacon
"I knew no earthly good would come of it," she said, with a satisfied, I-told-you-so air.The Heart of Arethusa|Francis Barton Fox
I stood there in the quiet hall, the old clock ticking away a solemn "I-told-you-so!"On the Church Steps|Sarah C. Hallowell
"I thought she was like that," remarked Ida, in an I-told-you-so tone.The Little Colonel at Boarding-School|Annie Fellows Johnston