Fool me once, etc. I cannot believe how long it took for me to truly learn this into action. I accept apologies, and I forgive. I now know, that doesn't mean I need to sit close enough to the flame to ever get burned again.
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.