Never. Quite possibly, this is the cruelest thing that you could do to someone. Particularly when you don't understand it or only know part of the truth (at best), anyway. Let people live; let people learn. (Those are not my words but well said.
It's time for me to have a nice life of my own, don't you think? That means I can't be part of your nice life anymore - in fact, I've never been part of it! I'm so done with your conditional love - that's not love. So have a nice life, and I'll have mine!