Most often, when a man cheats on his partner it's not because he doesn't love his partner any more, but because it's just something new and interesting. The love is still there. Women just get entirely the wrong end of the stick about it, and that happens almost all the time, whether they think it's true or not. Seriously, almost all the time, and it's often a big misunderstanding.
There's another thing I hate about women. It's the way, when they're comforting another woman because her partner forgot their anniversary or forgot to pick up the milk or something small like that (small like picking up the milk, that is - an anniversary is of course a bigger thing), that they're so eager to degrade and insult men (as a gender). Last time I checked, men don't slag off women whenever one breaks their heart. It's not fair.