When love and money collide, even strong couples can start to feel tense. According to a survey conducted by online money moving giant Paypal last year, money is the No.1 issue couples fight about. It tears relationships apart. Not surprisingly, some couples employ a not-so-useful strategy to ease the conflict - they commit financial infidelity. Is this a new-fangled type of betrayal, you ask? In a word, yes. Pretending money problems aren’t there only makes the fight worse.