The temptation of eating the forbidden fruit does play its role too. Some women just want to know what lies beyond the boring unknown. Her new lover may take care of her like a princess or else even a queen thus opting her to become a cheating partner. All the costly gifts and rare caressing though do have their effect but stay not for long!
The more a relationship turns older, the more mechanical it keeps going along to the extent of all the romance getting squeezed out of it. And to catch a cheating spouse will now be in your motives. A new beginning always signifies a new romantic dream. He may make her believe that she “looks beautiful” or “appears very attractive” and she falls for the one who has such a great opinion about her. Her spouse has forgotten to say “I love you” since long with the same passion that he once upon a time said it with… and now here is another chap who has the same passion in his voice again!