Marriages evolve past that initial state of “honeymoon,” as the metaphor suggests (and is often extended to other human relationships).
231. A word should also be said about those whose love, like a fine wine, has come into its own. Just as a good wine begins to “breathe” with time, so too the daily experience of fidelity gives married life richness and “body”. Fidelity has to do with patience and expectation. Its joys and sacrifices bear fruit as the years go by and the couple rejoices to see their children’s children. The love present from the beginning becomes more conscious, settled and mature as the couple discover each other anew day after day, year after year. Saint John of the Cross tells us that “old lovers are tried and true”. They “are outwardly no longer afire with powerful emotions and impulses, but now taste the sweetness of the wine of love, well-aged and stored deep within their hearts”.(Cántico Espiritual B, XXV, 11) Such couples have successfully overcome crises and hardships without fleeing from challenges or concealing problems
Obstacles not concealed or avoided: I would say this is one aspect of a fruitful marriage. Not the absence of crisis, but a direct confrontation of the challenges every marriage will face, regardless of any circumstances.
Thoughts on that? For your reference Amoris Laetitia is online here.