I gave an interview on what is worse than cheating and if you look at the research, this is hands down, the worse thing that could happen to your relationship. It’s common—that is why the divorce rate is still high.
Like I said in the article, when a couple is engaged in constant negative interaction, and persistent negative thoughts about our partner as selfish, or only out for themselves, unsupportive, or even dismissive of our own needs. The fundamental issue isn’t about communication or problem-solving skills, but about trust for each other.
This betrayal can take many different forms: Putting our career (or other relationships) ahead of our romantic relationship, sharing intimate troubles with others that our partner would find uncomfortable if they knew, not bringing things up or lying in order to ‘keep the peace,’ negatively comparing our partner to better choices (physically, intellectually, emotionally, you name it), withdrawing affection and intimacy, disrespecting and belittling our partner, or breaking a promise our partner asked of us to trust us.