Your partner wants to leave, but doesn’t know how to tell you
This probably isn’t the reason you want to hear, but some people cheat on their partners because they want to escape the relationship and don’t know how to tell the other person. If they could use their words instead of their genitalia, everyone would walk away from the relationship a little less hurt.
“Sometimes the truth is that a person is just looking for a way out and rather than have an honest albeit painful conversation – they resort to cheating – sloppy cheating. Rather than admit that they are no longer in love with their partner they turn to another and they don’t cover their tracks very well, they want to be caught – they want out but lack the bravery and emotional intelligence to put this into words. In this instance – almost anyone will suffice in the role of `other`they too are surplus to needs.”