I think it's at the point you both decide to be exclusive, if such a time exists. It's always a bitch when one of us decides and assumes the other feels the same way though ain't it?

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As to marriage or celibacy, let a man take which course he will. He will be sure to repent - Socrates

Love is not looking in each other's eyes, but looking together in the same direction - Antoine De Saint-Exupery