Today you have to ask someone hard questions, and be prepared for hard answers.
You need to ask some very difficult questions of someone today, and you will have to be prepared to hear some difficult answers. While this is going to be tough for both of you, is not it better to be honest and have everything out in the open, rather than be dealing in lies and hidden truths? With the air cleared, no matter how unpleasant, you can both move forward.