If you can find a friend or family member that can tell OWH FOR you, the result is the same - an exposed affair.

if you are affraid, find someone ELSE to do it.

You COULD try a different route.. talk to the OWH as if you are trying to confirm there IS NO AFFAIR... he may tell YOU there is... and you are again off the hook.

If you are afraid, there are routes around that to get to the same point.