Most Helpful Guy
Well, the male mind, or any mind for that matter, is reactionary based, which mean's that all individual's generate thought's based off of the reaction's of there environment or internally gathered data.
From there we conclude, that if a guy cheat's on his partner, there is something generally wrong with him as a person, no good person would do such a thing, as to why? Human psychology, evolution, etc etc etc, the basis to summarize the situation is to conclude the individual as doing wrong, and therefore must be corrected one way or another.
I am sorry, if you have been cheated on, you were wronged, and I apologies on behalf of those whom have wronged you.
A good relationship, is based off a fundamental framework of shared belief's, the greater your beliefs, the better the relationship.
Continue an effort into finding people who share the way you see the world, and who would want to share the world with you.
Anything else is futile waste of effort, in regard's to the pursuit of relationship's especially that of romantic one's.
Most Helpful Girl
Good question I wonder the same thing, It doesn't make sense does it? I don't know if I can even reason for them. If I did I guess I would say that maybe they don't know how to say no if someone (a girl) pushed themselves on them, or they saw someone they really like they get tempted.