(Dsiclaimer: this is NOT based on experience)
He/She cheated. Not sexually. But he/she cheated.
Cheating isn’t only about having sex with someone who isn’t your partner or spouse. Cheating can also take place when you prefer to do activities (other than sex) with someone other than your spouse. It could be as simple as playing games with someone and enjoying their company when you should be with your spouse to celebrate a minor achievement he/she had. Leaving him/her alone to do some tasks that needs to be done by the both of you. I guess, this is what you can call Emotional Cheating. Other than mentioned above, you prefer to talk to someone else other than your spouse. Topics varies from nonsense to serious matters that you can always talk about with your spouse but chose to talk about with someone else. These things will leave your spouse thinking, “Am I really not enough?” “Is he/she really better than me?” “Can he/she really make my spouse happier than being with me?”. All these questions and more would come to mind. If this is you, you are feeding your spouse’s insecurities which will then lead to depression. Can you really afford to see your spouse depressed?
Random thoughts 