It is difficult for us to imagine eternal delight in relationships that are currently dysfunctional in this life. How does God remove emotional pain in heaven, particularly when it seems heaven is not a place of forgetfulness or unrecognition? We can’t be sure of the process, yet it is certain that Jesus “wipes away every tear" (Rev. 21:4), and somehow brings ultimate and final healing to fractured people and broken relationships. The beauty of heaven includes the redeemed finding their relationships eternally enjoyable.
But an even more difficult question is this one: What about married people who have really good relationships here on earth? What about spouses, for instance, who consider one another their "best friend"? How can a marital relationship be enhanced if there is no marriage in heaven nor any sexual expression of love (Matthew 22:30)? For followers of Jesus, sexuality is the ultimate expression of covenantal intimacy, a belief contrary to the world's view of sex. It is difficult for many Christian couples to see how a great marital relationship can be enhanced in heaven when the sexual intimacy in their lives is no more.
The brilliant C.S. Lewis addresses this very subject in his book Miracles. For those widows and widowers who have remarried in this life, for the husband and wife who consider each other their "best friend," and for other followers of Jesus who simply have questions about the absence of sexual intimacy in heaven, read carefully the words of C.S. Lewis below and remember that you and I have yet to experience the joys that await us in the resurrection, so it is difficult to imagine resurrection life in the earth's New Creation state.
“The letter and spirit of scripture, and all of Christianity, forbid us to suppose that life in the New Creation will be a sexual life; and this reduces our imagination to the withering alternative either of bodies which are hardly recognizable as human bodies at all or else of a perpetual fast.
As regards the fast, I think our present outlook might be like that of a small boy who, on being told that the sexual act was the highest bodily pleasure, should immediately ask whether you ate chocolates at the same time. On receiving the answer “No,” he might regard absence of chocolates as the chief characteristic of sexuality. In vain would you tell him that the reason that lovers in their carnal raptures don’t bother about chocolates is that they have something better to think of. The boy knows chocolate: he does not know the positive thing that excludes it.
We are in the same position. We know the sexual life; we do not know, except in glimpses, the other thing which, in Heaven, will leave no room for it. Hence where fullness awaits us we anticipate fasting. In denying that sexual life, as we now understand it, makes any part of the final beatitude, it is not of course necessary to suppose that the distinction of sexes will disappear. What is no longer needed for biological purposes may be expected to survive fore splendour. Sexuality is the instrument both of virginity and of conjugal virtue; neither men nor women will be asked to throw away weapons they have used victoriously. It is the beaten and the fugitives who throw away their swords. The conquerors sheathe theirs and retain them.”
C. S. Lewis, “Miracles,” The Best of C. S. Lewis (Christianity Today Edition; Washington, D. C.: Christianity Today, 1969), pp. 357–58.