Dee Dee and Emma from "The Turning Point". Not really theater related, but a good mix of comedy and drama. Also dialogue from the film "Stage Door". Not sure what you are looking for, but just some ideas.
"He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion."
-- Author Unknown