I will say this if you decide to stay together then consider sleeping in separate rooms. It really isn't that big of a deal anymore as it seems more and more couples are doing it. You made a comment about how your wife doesn't like to be touched when she's sleeping so if anything this should at least help the both of you get some sleep. Doesn't mean you can't cuddle sometimes or anything like that instead it just helps both of you get some space.
Plus you don't have to worry so much about waking up your partner, covers being unevenly distributed, or snoring.
Anyway this explains it better:
Should Couples Sleep in Separate Beds? - DivineCaroline
Still there's a part of me that strongly suspects she's having an affair. Part of me wants to say that I don't want to scare you but this story seems to be a little to close to your situation.
I no longer want to have sex with my husband