Good idea to offer the papers in public. Just wondering, will you then both go home together (same car, same house)? Or will someone else drive you home? What if he waits until you are alone to show anger?
I see what you mean re not wanting to humiliate him by having a ‘witness’ present. It makes sense. I just want you to be safe and/or able to get away (escape) if things were to escalate.
How about having someone on stand-by while you tell him (e.g. outside). This way, they could intervene if things were to turn ugly.
Good luck.. and be safe.