There's a saying that sometimes you "have to be cruel to be kind" because in the end the pain that person felt from the cruelty will help them move on. It's really hard to actually do that, to say things that you know they don't want to hear, just because you see their need to believe what they want and you don't want to be the one to burst their bubble. Maybe it's not your place to say what you think and you should just mind your own business and let them learn on their own. But sometimes you can't just sit back and watch them get hurt, and even though it kills you to say it, hopefully they'll understand that it's for their own good and that everything will be better in the long run..