Theoretically the wife doesn't know I am back in his life.

He went from happy and not interested in sex to miserable and willing to give sex a go, doing little and smoking lots of dope.

He now goes out rather often, is very cheerful, has cut back on the dope, but gets moody and/or poorly if he doesn't get time 'to himself'.

And in the words of my good friend: "I'd smell if he was seeing another woman" - The wife appears to lack physical and emotional sense of smell it seems.

She could be so confident that having had the conversation, made minor changes in their life and reinstated a sporadic sexlife everything is fine, but I can't help thinking she knows and is turning a blind eye.