As far as most guys cheating, well it does seem like the majority of them do. Not just from my experiences but other girls too. If you don't think your guy has cheated, 1. He hasn't (good for you) or 2. You just haven't found out yet.
I'm not doubting that a lot of men cheat -- women cheat too. It is all because of evolutionary reasons; for men, there is the biological pull to spread their seed as much as possible (that's why a lot of them are so "sex-crazed") and for women, if they're not happy with their current man as a provider (especially emotionally), they'll try to look for it somewhere else. There is also the selfish factor in that people want to have their cake and eat it too - that's why they don't bother to break up first in many cases.
As for your scenario options as to if your mate has cheated or not...#1 has to do with his intelligence and personal values; it has been scientifically demonstrated that the higher a guy's I.Q., the less likely he is to cheat because he recognizes he is more than a *bleep* and also the emotional effect it would have. There is a difference between a good guy and your average idiot, you just have to become adept at realizing the signs. #2 Unless you're totally clueless, there are going to be unavoidable signs that something is wrong.
Another thing is most marriages fail after awhile, there are some that work (my parents for instance)
Uh, most relationships in general fail. And yet no one really asks how many boyfriends you've broken up with, just how many divorces you've had...as if the latter was infinitely worse. I believe most relationships fail because people are f*&^ing selfish! Which is also evolutionary, lol.
I will also say there is nothing wrong with a girl sleeping with how ever many guys she wants and should not be judged or labeled.
Yes, it is not "wrong" so long as she is doing it of her own volition...but engaging in such behavior is inevitably going to get her judged and labeled because most people don't think that is the best way to conduct oneself.
Seems like some women have some kind of primal competative rage in them to where they need to call other women sluts or say it is wrong so their chances of getting a mate go up.
Mmm, it's not a "primal rage", it's just there DOES need to exist that balance of men and women who aim to only sleep with people they are in a serious relationship/in love with. Because at the end of the day,
I don't want to be with someone who's slept with dozens of people just because they can. That does not reflect well on his ability to commit and care for ME ONLY. Because I'm selfish like that.
And I know most women are selfish like that, too.