Time is a great healer. Try and just sit with it. Don't think about it too much. You were trying to do the right thing. Be still with the contentment that you were being open and honest and that they weren't. Karma. I'm not meaning this in a nasty way but if you continue to be true and honest, you will not suffer. They will. You cannot be in their shoes to see how they suffer - additionally, what they consider to be suffering may not be the sort of suffering that you might 'want' for them.
Not sure what else I can say other the time heals all wounds.