infidelity can be the most devastating thing that can happen to a relationship. although many factors may lead a person to a relationship outside of their committed one, the pain and grief it causes are not unique. a betrayal of trust can be brutal to repair. let’s talk about the difference between infidelity and adultery. adultery often refers to a physical relationship outside of marriage. in some states and jurisdictions, adultery is the term used as legal grounds for divorce. …