Oh, thats awfull Peter! what you show in those videos ;-)
I don´t think a realtionship will ever truly survive unfaithfulness, even if you talk it trough between you and come to an understanding, it will always hunt you. And it is so easy to be tempted.And if you have done it once, then you will maybe be more tempted??
I think one should keep away from one night stands and even affairs if you have a partner. But if you do, I still believe the best way to brake up, which might be the result after all, will be to tell it directly and gentle - it is SO false to go through others.