Your beloved is your Nemesis

You have been a super hero/villain very known. Your secret identity is only known by yourself. You have been married for few year, after had many year of friendship with you beloved one. The big thing is, your beloved one also has a secret identity. When they are using their powers, they have been your Nemesis for the past few years. You two don't know about the secret identity of each other. Would you fight? Arrest, defeat? Or you think you can change the other's mind?