It doesn't matter what sort of relationship it is, long distance or seeing each other every night. Both parties know what sort of relationship they are going into, and they know it will be lonely - they also know it won't be forever (usually).
Frankly if they can't keep their pants on, then they are lowlife. Loneliness is not an excuse!
There are some real excuses for cheating in a relationship, any relationship where both know the score from the start though is not one of them.
No relationship can manage without trust, it's true what they say, that it can take years to build up and seconds to destroy
