Mia, Hi,
An answer to your question, a guess. Its just too big a question. So many approaches and variables.
I think it was Auden who opined that any marriage is more interesting than any romance.-- Really?
How the genders actually sustain and accommodate one another in fine is wonderfully complex and perhaps is also too personal for novels or flicks or casual conversation. To say anything about it set one up for 'Oh, that's not the way I see it at all.', doesn't it? Or, more prudently, silence.
How did the congratulations kill the mood? Harder to say than imagine.