Psychology Experiment: "The Law of Marital Infidelity" - Psychology - Psychology Express

The experiment itself was not particularly special, but the conclusions it drew were very interesting: you will have a greater liking for those people who initially evaluated you poorly but later evaluated you positively. This phenomenon is called the "gain-loss principle of interpersonal attraction" or simply the "gain-loss principle." Aronson humorously referred to it as the "infidelity in marriage law," implying that praise from strangers is often more appealing than praise from one's spouse. This is because over time, the spouse's level of affection may gradually decrease, whereas praise from a stranger, which shifts suddenly from indifference to approval, can leave a deep impression. Thus, this psychological tendency harbors the potential for infidelity in love. - psytopic.com