By Emma Mackenzie With just a glance inside his suitcase, her life was in tatters. There is no doubt about the fact that discovering your partner has been unfaithful can be totally catastrophic, and this kind of betrayal can be even harder to recover from if you share children. For one woman, she thought she had the perfect family after five years of marriage – but one simple mistake from her husband exposed a devastating truth. Before Karen married Mark, she had already made her peace with the fact that he had to travel a lot for work. When the couple welcomed twin girls into the world, he sp…