Don't tell him anything of the sort about your current mental situation. It isn't his business.

My ex and I had a very civil divorce with no abuse, infidelity, or addictions and she initiated it. When we were moving out of our house after living together for 6 months while divorced I saw her father, who I only marginally tolerated. He asked me how things were going and I smiled at him and said "Any better there would have to be an investigation," and borrowed a cigarette from my former brother-in-law and smoked for the first time ever in front of him.

You never let them see you sweat, and you never explain why you don't want to see them.