Accountability goes a long way toward sustaining marital commitment. There must be people in your life that you hold yourself accountable to. This way, sustainability is easily achieved at every point in life, especially when it comes to marriage.
Likewise, your intending partner must have people that he or she holds in high esteem, and both of you must have the culture of being accountable to each other, both in courtship and in marriage. This way, commitment will be easily sustained for a forever love journey.
After God, who do you and your spouse make yourself accountable to?