It seems that TAM is somewhat biased towards believing this quote at face value. I was curious if there is current research to back up this so-called "proven-fact" that is often expunged by Internet tough guys; the same guys who believe that you should dump her at the first sign of infidelity, if you are a "real" man.
I wonder if these guys have real marriages, real children, have real mortgages, and live in the real world of real human nature?
Can trust be rebuilt? Do we underestimate the ability to change? Are some people more likely to cheat again than others? I believe before a cheater can even consider changing their ways, they must work thru the issues that drove them to stray, which may take time thru IC.
I did find some current studies that showed about 70% of those who cheated in the past were now faithful in their current relationship. The study indicated that the 30% (repeat cheaters) shared some common dynamics, to include:
1 Genetic disposition (a certain gene is not present, and almost all shared the same lacking gene with a parent, who also cheated)
2 Reported to have "fallen out of love"
3 High level of self attractiveness
4 High level of sex drive
5 In men, larger sized testicles were more likely to be repeat offenders, perhaps greater T levels
Since you clearly need something to occupy your time and mind, instead of wondering these things, study a few university level statistic papers or pop over to "Khan Academy" website and study there.
With a better understanding of how statistics works you will see how the groupings work and how the statistics are _actually_ applied - and thus how meaningless most such "results" are.
eg (4) is actually a symptom of cheating, not a cause. While (2) is completed self-selected, and if asked many of those giving that answer would have some seriously problematic definitions of "love".
Indeed, a simple small sample of self-selected answers taken from this thread highlights the majority of causal factors. ie a "Purposeful" sample selection method, drawn from a selection of people who have experience in the matter, and whom interact with large numbers of similar qualified people, with an interest in gathering data in that area.
Things which contribute:
(1) Self-orientation about desires (can be in any of the relationship partners. e.g. if ones' partner is obsessive about their work, it skyrockets the chance one of the partners will cheat. In TAM that's the HNHN factor
(2) Morals. A person who is strict, and rigid about their own adult moral patterns, is less likely to cheat.
(3) Communication without dependence. Someone is willing and able to _honestly_ communicate their internal reality is less likely to suffer from difficulties in (1) and (2).
I'd put the ratio of importance (eg if you're doing a regression and weighting the factors) as 80% (1), 16% (2), 3% (3). Basically, and I think cheaters will confirm, that pretty much "they were just being inconsiderate *******s"