NEVER reveal the source(s) of your intel. If he asks you how you know, just say "I'm not going to tell you. The important thing is that you've been lying to me, and it's incredibly disrespectful to me, our marriage and our family."
If he asks you why you won't tell him, say "Because I choose not to."
If he accuses you of being sneaky, say "I'm trying to protect myself and our family. Why have you been lying to me?"
Don't let him focus this on YOUR behavior; it needs to be focused on HIS.
However, that all being said, try not to engage at all. If he gets loud, rude or disrespectful, END THE CONVERSATION IMMEDIATELY.
