Remain faithful to your spouse so that your marriage will be able to last a lifetime. A faithful commited spouse is one who is trustworthy, honorable and loaded with integrity. When you stray from the marriage it leaves room for the enemy to divide and conquer. Once trust is broken it takes a while to regain what was lost.
The grass may look greener on the other side, but don't get fooled it may be crab grass. Continue to nurture and care for your own grass and watch and see don't it grow. Meaning your relationship needs tender loving care so that it will blossom into a marriage of longevity and endurance.
Hebrews 13:4 (NLT) "Give honor to marriage, and remain faithful to one another in marriage. God will surely judge people who are immoral and those who commit adultery."