Did your partner cheat on you? Are you sure? Does one of you think the other cheated, yet you can't agree that cheating has occurred? Which behaviors constitute infidelity? Is kissing another an act of betrayal? Is excessive texting or emotional sharing with another infidelity? Is there an identifiable line? How can it be so confusing? Affair recovery expert Terri DiMatteo, LPC of Open Door Therapy, clears up the confusion.