How is a Open Relationship a good Relationship?

All I can imagine happening in a open relationship is just openly cheating honestly. Because at that point you've downgraded to being friends with your wife
Scenario
Husband: hey welcome home wife, woah I can't remember that last time you wore that stunning dress you look amazing how was that dinner date you went on and wha, who's this? I don't remember you telling me you'd bring someone over but come on in
Wife: hey husband remember when we discussed having a open relationship a few days ago? Well this is Chad we'll be upstairs don't bother us -wife locks door-
Husband: dang, they sure are loud up there, I can't even sleep on the couch for very long hearing how loud that bed squeaks maybe I should invite my friend over for a movie
Husband's friend cassie: -cassie arrives- hey friend ready for our movie?
Husband: heck yeah! Also don't mind the bed squeaking loudly upstairs it's just my wife and her boyfriend I guess but it's been a while since me and my wife did things together
Husband's friend cassie: oh I didn't think you were the kind of guy to be in a open relationship you seemed like more of a traditional marriage relationship type
Husband: honestly yeah but I just wanted to keep my wife happy so I agreed to it. Honestly though I feel kinda bad.
Wife's boyfriend Chad: walks to the front door but is stopped by wife begging him not to go but Chad leaves anyway
Wife: -looking at husband- why did Chad leave? All I told him is that I have a husband and im looking for a open relationship is that so wronggg? and Who is that woman sitting with you?
Husband: wife I don't know Chad personally so I just don't know, and this is cassie she's a friend of mine I've introduced you to her a week ago
Wife: whatever doesn't matter I want chad back -goes upstairs and locks door-
Husband's friend cassie: im no marriage counselor but I think you two maybe heading towards divorce.
Husband: I hope not
Cassie: you're doing more to keep her happy than she is to make you happy.
How is a Open Relationship a good Relationship?
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