A spouse who is cozy with God sees life from God's perspective and consequently makes better judgment calls on matters affecting their relationships. Give diligence to present yourself approved unto God, a workman that need not to be ashamed, handling aright the word of truth. Our life long pursuit is Godliness, not happiness. One reward of that pursuit has been happiness in our marriage. The more intense your pursuit of happiness is, the deeper you become mired in selfishness.
Selfishness isolates people by souring relationships.
Sour relationships cause precipitous actions which shatter marriages. Develop a passion for living life God's way and you'll find all the happiness you ever wanted. Blessed are the merciful, for they will be shown mercy. This is the boomerang beatitude. What you throw out comes back to bless you.