Meh the human midn is screwed up. Ya've got your concious and your subconcious. They work togetehr to a certain degree. best example i can give really is a rider and a horse.
The concious mind is the rider, telling the horse what direciton its to go and giving it commands, our subconcious being the horse is the one that does the work and places his feet. Now if the rider were to try controlling the horses footing there would be problems.
Now by that what i mean is, we dont always want what we think we want. So yes some men will get married and they do want to in their minds, but their subconcious dosetn so they set about going behind ppls backs cheating and lying.
Now I'm not saying its exscusable, far form it, all i mean is that sometimes its not intentional and this is due to a lack of knowledge of our subconcious. Me? I have a healkthy relation with it which is why i'm always so sure of what i want, but i was lucky enough to start studying a subject that taught me this.
*EDIT* This is not neccisarily correct, its just my own thereoy and stuff.