While it's not anyone's place to give a moral pass to cheaters, there are steps a couple can take when choosing to rebuild their relationship after infidelity - steps that can be valuable to any relationship.
• MONOGAMY IS SUBJECTIVE
Couples often have different definitions of "monogamy." Even science has a difficult time clearly defining the term. To some researchers, infidelity can be the emotional pursuit of other romantic companionship - even the ephemeral nature, such as flirty texts and having an office spouse. For others, it's cheating only when things get physical - as in making out or having sex.
In fact, an inability to transparently discuss the concept as a couple can cause problems throughout marriage, said Tammy Nelson, a licensed psychotherapist and author of "The New Monogamy: Redefining Your Relationship After Infidelity."
"I think the most important thing - whether you're in the beginning of a relationship, or if you're recovering from infidelity - it's defining 'what monogamy means to me,' " Nelson explained. "It's so negotiable," she continued. "Is it cheating if you're talking to your ex on Snapchat? There are so many ways to define it, and it's different for men and women. There's a difference between privacy and secrecy."
As Nelson puts it: Access to online platforms and technology - such as social media and cellphones - makes the terms of infidelity difficult to pin down. "We never had these challenges before," she added. "It was never like, 'I promise to love and honor you and tell you every time I have a new Facebook friend.' "
To meet these challenges, she recommends that all couples - not just those in which a partner has cheated - create social contracts stipulating what monogamy means within their relationship. One couple's version of monogamy doesn't have to match anyone else's. "I can't define it for (my clients)," continued Nelson. "Those are the things you talk about, like porn. Do we watch it together? Do you watch it alone? And what does that mean to our relationship? Monogamy doesn't have one definition anymore. It's not your grandma's monogamy."
• EXPECT EXPECTATIONS TO BE TESTED
A couple's expectations might be challenged and evolve, and not every breach is detrimental. "So many young friends of mine say things like, 'I would not put up with this or this or this.' And then you get into a marriage and you realize you have to put up with so many things and it does occasionally involve weird things with other people," Calhoun said.
"That's part of negotiating in a relationship. Finding ways to stay in love with someone, and when it's possible, going deeper and learning things," she continued. "That's not to say you should put up with someone who is chronically disrespectful and cruel, but I think it's amazing the things you can get past."
Once the shock of an affair has died down, Nelson said it's important for any couple working through trauma - whether it be a breach of trust or another source of contention - to take a step back to untangle fact from fiction. "I ask (my clients) to talk about the stories they made up about the affair. And everyone has a story about what it means to their partners, what it means to them, what it means to their relationship. There's about six stories in the room," she explained. "We make up stories about what these occurrences mean about us and what it means about the other person. But it doesn't mean those things are true."
This follows the crisis phase, when a couple is "freaked out and no one knows how to give the other person reassurance." As a second step, working with a professional such as Nelson through what is projection and assumption vs. what actually happened can help a couple untangle perception from reality. But it's the third step of moving on that takes the most work.
"You can't make a choice about staying in a marriage until the third phase," she explained, when you create a vision of the relationship. "You can't go backward. You can't go back to the place before an affair, or you will end up cheating again. You have to create a new relationship going forward."
"Any major crisis in a relationship will go through those same phases, particularly if it's traumatic," she continued. "Trauma works its way through by having a crisis. You learn from it, and then you can create a new vision for your life."
• "ONCE A CHEATER, ALWAYS A CHEATER"
Seriously, stop saying that.
"Everyone is going to tell you that," Nelson said. "Your friends and family may have your best interest at heart, but if you tell everyone about an affair and you stay together, it'll be painful later because they'll choose sides. You'll be feeling shame for staying. Go get therapy instead of telling your mother and your best friend."
"Nobody understands the relationship except you, but everyone will have advice," Nelson continued. "You have to take it with a grain of salt and not make decisions within that first crisis phase. You go into all the cliche places."
Instead, keep the conversation flowing. "It's good to remember that your partner isn't a stereotype. They have feelings," Calhoun said. "And because you committed to them, you agreed to listen to what they say and take it seriously."