my opinion - what you call "open marriage" is just a way to excuse cheating by one partner, while the other partner wants an exclusive relationship and is extremely hurt by their spouse's cheating.
here's an idea - suppose the "open marriage" was for your wife to explore other options, while you remain faithful. that's not what you had in mind, is it? you were thinking that you would be allowed to cheat while she must remain faithful to you. right? be honest, now, no saying that you think both partners are allowed to have an "open marriage" when what you really mean is what I described.
and even if you are so open-minded that you wouldn't mind her cheating too (which I doubt) as long as you are allowed to do it, would your wife agree to an open marriage? I doubt it.
the essence of marriage is an exclusive relationship. anything else is hurtful for the other spouse.
