Sometimes I use "I told you so" to express similar meaning, but this is more often used in the scenario where someone didn't listen to another's warning, not the other way around. I want to know if there's any expression for this?
Example: Peter has never played football before. John told him it's fun a lot of times, but he rejected that and said it's a stupid game. But he accidentally joined a football match one day and immediately fell in love with it.
Are there any other phrases or idioms that John can say to Peter?