can you cheat and still have an intimate relationship?

[gamblore99]

the banged her best friend post sparked this. I don't understand how people can cheat on there girlfriend/fiance/wife whom they claim to really care about. I mean, how can you look this person in the eye after you have lied and decieved them? All trust is shattered. It's one thing if it is just a sexual relationship with no real feelings involved (though i don't think i would cheat here, dunno really), but if you really care about someone, wouldn't cheating ruin your entire relationship? especially if you haven't told her.