Click on the red arrow and a box appears with the spouses names listed, and 'none' who have been deleted as a spouse. Choose 'Edit Spouses', then highlight the one you want to get rid of. Any deleted spouse will just be a blank line which can be removed. Click 'Remove Link' and it's gone. Then you need to click on the trashcan icon at the top of the program and delete the ones you know for sure don't belong in the database anymore. If you leave the trashcan with entries in it and create a gedcom, they will be in the gedcom file.