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\\\ And the trust that you have has been blown into smithereens.\\
No, not necessarily. There are pluses and minuses to ANY marriage and infidelity is a human failing that we all have to face at certain times.
When this happens, then one has to do one's sums and ask oneself if this "infidelity" can be overlooked. If the answer is that one will be simmering with resentment for the rest of the marriage, then fine.....end it.
if this was the case, then very few marriages would survive.