You've honed in on my dilemma quite precisely. I didn't want to outright tell him I disliked his girlfriend-fiancee-wife as I felt I should be supportive of his relationship choices (assuming she just doesn't meet my preferences rather; if she was a truly awful, unethical being, I do think I'd let him know that view). But by not telling him how I felt about her, he assumed we were friends. Lesson learned. Maybe it needs to be a thing, to explicitly have 'the talk' with friends about privacy not being extended to significant others and spouses.