How do you end a relationship that isn't working?

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Relationships are wonderful to be in, in the beginning. You,sweethearts, can't get enough of each other. Your love, whoozes from every pore in your body, but then "sweet nothings" turn into just "nothings." How do you end your relationship that has no future? Would you cheat (hoping to be caught) with someone else before ending the present relationship, would you constantly fight (verbally and physically) until one of you says, "I quit?" Or would you calmly sit down like ration people and agree that the relationship is dead, and you each should go your seperate way? I did the latter.