Can't say that I wouldn't do the same seeing as they would likely prioritize your life over a wedding. However, is it possible to come "completely clean" after the wedding? Because truth really is best.

I've never lied to T about my s.h. but I never have to go into detail telling her where, how, etc. She usually just ask if I gave in to my urges, my old spot (that she knows of), new spot (she hasn't been told exactly where) or other.

Add: Sometimes I don't mention that I s.h.'d at all but I don't think it's a lie as it isn't relevant to the conversation. It sounds like your T pretty much asks you about it though.