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As the saying goes trust takes ages to build up but can be broken in a split second. A moment of madness whether drunk or not.
The truth is I think you have to try and work things out sometimes but it always depends on the individuals involved. The question you have to ask yourself is were you 100% satisfied with the relationship? Drunkenness can bring out the hidden side of you i.e maybe dissatisfaction of being with that person or something was not being fulfilled. I'm not saying that's what's happened here but you will need to ask yourself that question.