Well said TL4everu2, I'd rather be a snooper than a liar. I had to write my last post on this thread in a hurry and after I'd pushed send I thought "hey wait a minute".
I can let my snoopy behaviour go now because Z has been very trustworthy for the past 5 months. But prior to that he did stuff up reasonably regularly and it does eat away at the trust. There is an element of self-preservation in snooping.