If she wasn't happy what was the reason of her staying she was just as heartbroken as he was.

I completely understand what you feel and you are going through as I am in a similar situation. I wish there was some miraculous answer to solve it. Emotions make it very hard to see clearly. Keep praying and asking God for clarity. Remember taking the narrow path leads to great rewards. Rather than cutting it off completely or ending it forever, just tell him you need to cool it for a period and then perhaps you will be able to gain a better understanding about what you should do. Cutting contact for a set and shorter period seems more do-able than forever with the way you are feeling at the moment I am sure!
Good luck!