These words are taken from Italian Witchcraft by Raven Grimassi:
When a man and a woman join their lives together through ritual, and the love which they share, then they are linked to each other in another life to come.
Yet being together, know that each of you must be alone. Understand that even though you are bound together, let this not be as captives.
There shall always be others with who each of you may desire to share a closeness, either physical or spiritual. This is as it should be. Let your love desire fullness of life for each other and also pleasure for each other. Honor each other with openness and honesty.
Because you have joined you lives together, you are sanctuary and comfort for each other. Together shall you stand in all things, for you are true friends.
You are together because of your love, and you remain for this reason. Yet if this reason for coming together is forgotten, or fades, then it is well to part if needs be such. You do not honor the joining by remaining without love. Neither do you honor each other.