Just my opinion here, but I really think you should take a step back from this entire situation and allow this couple to discuss their marriage and whether it should continue or not. Is there a friend or family member you could stay with for a few days to allow them this space? If not, I believe you should simply go about your own business for a few days and allow them to make their decision. You could all get hurt very badly if this situation is allowed to continue in its current state and you will most likely find this man will not thank you for the outcome.
Please for now, take a step back and allow the couple to speak candidly with each other.