Nobody wakes up in the morning and decides, "today is the day i'm going to cheat". I don't believe it is ever a calculated venture from the inception.
It starts with the innocent hello, which ends up in hell, and now that the cell phone has evolved into a compressed laptop, social networking has never been more easy. So if you are spending too much time strolling down digital Memory Lane, an emotional affair could be in the works_ you are a human being, are you not?
What started as a match of wits ends up in one partner sharing himself or herself with another person, which chips away the foundation of core relationship, creating a platform for a new one.
A friendly relationship snowballs into something more meaningful, a feeling of connection with that other person which supersedes a current relationship.
Lets beware of the dangers.