Why guys always cheat on their girlfriends???
not all guys cheat, if you seem to be getting into a lot of relationships where the guys cheat try to go for a different kinda guys. I know I usually go for the "bad boys" and usually it ends up coming and biting me in the butt.
They don't ALWAYS cheat... don't generalize. The guys that DO cheat, do if for similar reasons as some GIRLS do.