n00bs,
You are so far off the mark its not funny. OK, you want the facts, here's the facts...
They've been married for about 10 years and she has never cheated on him once nor wanted to. She is completely in love with this guy and he with her. They share the same dreams and have two kids together who they both adore.
Problem is that when they were dating they used to have sex all the time. She's got a huge sexual appetite, he doesn't. A few years into the marriage and he's gone off sex. Not completely, just not nearly as often as she'd like it. She's talked to him about and tried to do things to get him interested. They've even done counselling about it. For 10 years odd she's been working with him to try and resolve this sexual imbalance. In that time she has never once cheated on him.
After 10 years and with the marriage headed for divorce she threw out the lifeline of considering an open marriage so she could stay with him. Was always a long shot and unsurprisingly something they agreed wouldn't work for them.
She's now moving back to Melbourne and he looks like staying in Brisbane. Shame, they are a beautiful couple with gorgeous kids. But it does go to show what can happen when people are sexually imbalanced. She suffered it for 10 years before deciding to separate. Even now she is debating whether she's done the right thing and is considering getting back together with him because they are just so good together in all other ways.
Don't judge buddy, you're far too quick to pull the trigger.
Cheers,
Mike