Jay Ward

“When married people develop such an intense but inappropriate fixation to somebody other than their mate, they may be driven to jeopardize or even destroy a reasonable marital relationship. In the heat of passion, they seem incapable of attaching any real weight to the potentially disastrous consequences of their infatuation—the possible breakup of their marriage. They cannot “turn off” their infatuation even if they want to! Yet, when enough time has elapsed without their seeing “the other woman (or man),” they generally find that their infatuation dies down.”
― Aaron T. Beck, Love Is Never Enough: How Couples Can Overcome Misunderstanding – A Psychiatrist's Guide to Saving Your Marriage Through Better Communication