LOL, I expected a bit better from you. Nice twist of words. So marriage is now death? You been hanging around Rodney Dangerfield much?
Try again. Until means well until.
That's irrelevant to the use of the word "until."
Until means until; it does not necessarily mean the converse afterward even in English today - as I illustrated previously.
Eos ou in Matthew is used to tell that Joseph had no part in the conception of Jesus, that he had no sexual relations with Mary prior to the birth of Christ. This is obviously a very important fact to tell.
Other examples:
"And Milchal, the daughter of Saul, had no child until [eos] her death." and "'Sit at my right hand until [eos] I make Thine enemies Thy footstool." (Mark 12:36)
I neither of the uses of eos, is it meant that the converse occurred or will occur after the event.