A marriage works and is a marriage as long as both partners willingly and happily agree to and follow the rules. Many open marriages work. You just don't find out that they are open unless they fail... and they fail for all the same reasons monogamous marriages fail. But if they fail... then OF COURSE IT'S BECAUSE ONE ONE CHEATING... /SARCASM
How many monogamous marriages celebrate their 50th anniversary? Not many.
How many people in open marriages tell all their friends and family that they are in an open marriage? Not many.
How many marriages end up in divorce? A LOT.
How many monogamous marriages fail or have issues because of cheating???? A LOOOOOT!
If there was more communication and if more people married people that were on their same level of monogamy or monogamish, maybe there wouldn't be so many failed 'monogamous' marriages.
(and for the record... my boyfriend and I are monogamous... so I'm not biased and defending my own choices here, like some people are)
--
Anyway, this is getting way off track and shouldn't be a discussion about whether one idea of marriage is the right idea of marriage. The OP and wife have their own arrangement and you should respect that.