Why do you think people cheat on their spouses?

I don't think that is a good enough explanation. I feel that it has to do with the person cheating, they are lacking something. They need more self confidence and think that someone else may help with that.

I think it depends on the person and the situaton. Its hard to generalize for everyone. If a spouse if feeling neglected and unloved because their husband - or wife - doesn't want to have s*x or be affectionate and they are caught up in work or online gaming and never has anything to say - even the most confident person who normally is happy and feels good about themselves might find themselves wanting to stray. Sometimes a person wants to end it and this is how they choose to do it. Cowardly perhaps. Yes, in some situations its something in the person, but more often, it speaks of an unhappy relationship. I feel, if one is unhappy, they should voice it - perhaps more then once - in a calm manner and if the other has no interest in making a change in the relationships they should leave before cheating. Because to me cheating is being dishonest to vows which is unfair to your current spouse, yourself and any future relationships you may have.

Cheating is unfair to the other person. Perhaps after a person voices their unhappiness they should let the person know they want out of the relationship if it doesn't change. And they should follow through rather than cheating.

Do you think that people can sometimes just fall out of love? And maybe that is a good enough reason to end the relationship? Not cheat but just end it?

And its not meant to be.