It's kinda like this.
Most, not all, but most men were raised to believe women were these angelic, flawless creatures. And we believed we had to be on top of our shyt, basically be the best man we could be in order to attract the best woman.
When that first inevitable betrayal comes, it literally shakes the foundation of a man. You learn that everything you thought women were is a lie. You learn how selfish and cold and callous a woman can be when you no longer have her favor.
Then, the rules change.
You learn that you don't have to be the best man or really even be a good man. All you have to do is be a little bit more exciting and a little bit flashier than the dude she's with now. That's it. There's no honor or depth to it.
You learn that women are as simple as we are.
So we adapt.
We stop giving our all, because it wasn't going to matter anyway.
We stop being honest, because we learn that ya'll don't covet honesty.
We look out for ourselves, because it's what you would do in our situation.
That one woman who got the best of us, well she'll never know, nor would she care.
This is probably some of the best advice on women I've ever read on here. Once guys realize this, I think it will make it much easier for them to find somebody that they can relate to and start building with. Too many people give up before putting a bit of their ego aside for a minute and realizing that in every relationship there is going to have to be a compromise in expectations sometimes if they truly want it to work out for them.