Everyone can get cheated on. That shouldn't be the issue - because who you are and what you do doesnt mean ****. This is why you have all these guys becoming "alpha", or whatever nonsense, and still wondering why women are doing the same things as before.
It really comes down to mindset and tolerant level. A beta will allow himself to be jerked around, used, strung along, manipulated, cheated on, etc, as he has low self-esteem, places women on a pedestal, believes its his fault, that he must change to prevent this, she's really a good person deep down, he can show her the light, etc. He's basically too weak, afraid, and desperate to walk away, and clings onto her like no other. "This one HAS to work", he believes. He generally places himself below her, and allows her to run the show - while he gets controlled and trampled over.
This is also what separates the nice guys from bad boys. It has NOTHING to do with the women, because they are the way they are. A bad boy will **** a slut, whereas a nice guy will try to wife her up. He wastes more time, gives his heart out, sympathizes with her, waits around, tries to change her, etc, etc - only to get heart-broken and become bitter for years to come. This was all on him.
The bad boy, meanwhile, doesn't invest himself, gets in and gets out, and uses her as the slut she is. He doesn't care about what happens, because he never invested himself, took her seriously, etc. He doesn't get hurt; the nice guy does. Therefore, the nice guy comes on the internet to cry like a girl, because he cared and invested more. That is the only difference. Both parties - assuming the bad boy stuck around for sex or whatever - still got cheated on, and whatever else.
So, its basically how you approach each situation that determines how you are going to FEEL about, and be AFFECTED by the outcome - the outcome itself remains the same. Someone who has options, doesn't invest so much of himself emotionally, takes his time, has standards, etc, is far better off, and will be much less affected by being cheated on than someone who rushes in heart first, places all of his eggs in one basket (right away), enters relationship mode too soon, falls in love with a vision, places her on a pedestal, etc. He's too attached too soon to be able to just leave. It affects him deeply, and he ends up stuck in a horrible situation. The bad boy, meanwhile, has a clear head, wasn't emotional or affectionate, can't be controlled, etc, so he can leave without feeling much of anything.
Not to say you should be a player, hump and dump, never give your heart out, trust nobody, etc, but you gotta be wise and patient. Don't just give your heart and trust away like its candy - only to ***** when you get screwed over. It's your fault for not paying attention. Pick your targets wisely, and determine how you should proceed with each one. Being "alpha" isn't going to stop a ***** from being a *****. But, you'll be able to get rid of her easily - as you realise your worth, don't settle for garbage, are content with yourself, won't be jerked around or played like a fool, etc.
Most bad boys, indeed, are very smart. It comes with the street / people knowledge they have, but they tend to use it for selfish, manipulative purposes. They know how to use people, and prey on the weak. So, adapting these traits for good purposes (ie, weeding out the bad; recognizing them for who they are; becoming a better judge of character; being able to spot BS; etc) is highly recommended. Most bad boys KNOW when someone is good or trouble, and treat them accordingly. This part is good. How they use that knowledge for their selfish needs is bad.
I used to associate with these types a lot. They knew very well what was going on, and what people were like, and what their intentions were with them. Whereas the nice guys would jump right in like dumbasses - only to get burned by the same people the bad boys knew better than to get involved with.
Typically, this comes from experience, and getting burned. Too many people turn bad, though, and up leading fake, miserable, shallow, distrusting, lonely lives - rather than use the knowle,dge for good. Most bad boys are very hateful and miserable as a result of their lifestyles and mindset. They view everyone as the enemy who's out to get THEM, ironically enough. They're mostly just ****ed up in the head, and have a twisted, critical, pessimistic, judgemental, irrational, conspiracy-esque viewpoint - they're not necessarily "evil". But, bad is still bad - no matter how you swing it.
I always say, become a good person with bad-like traits. Of course, you have to be good to begin with.