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It is not clear from what the letter writer says if he and spouse have children. If not, it is time to get out right now. It is just a matter of what is best for you. I never saw the words "love, passion, adore, connection, soulmate" in this letter. If there is no love, no passion, no connection, and you have already gone through periods of weeks at a time without sex, that should be saying something. Time to separate right now. Don't have sex with your spouse, never again. Out. End it. Good luck!