Ask A Question About Islam And Muslims

Bismihi ta'ala

It is very sad that your husband suffers mental illness, and may Allah ta'ala grant him shifa`. 

Whether there is a relation between his mental health and his promiscuity and committing adultery is also irrelevant, and this means you must not allow yourself or the family (if you have children) to endure this. 

Your duty is to do nahi 'an al-munkar, inviting him to tawbah, and I am sure you have tried this, as you mentioned he has no remorse or guilt. 

If you and your family or his family have confronted him about this, and you feel no change is being made, then your option might be divorce. You do not deserve to be continuously mistreated. You also need to take care of your mental well-being, your piety and your spiritual atmosphere, to safeguard yourself and to distance yourself from such acts. 

He might be a good person in other aspects, but this kind of lifestyle is not at all befitting for any Muslim or person of religion. 

Give him an ultimatum, and act upon it. 

With prayers for your success.