I look back on 45 years of marriage and one thing is clear, our relationship was always at its best when God was in the center of it, when He wasn't just part of the equation, but when He was THE equation.
Selfishness is the destroyer of relationships. So I can also look back and see that when things weren't so good, to the point that it got my attention, one or both of us had been acting selfishly.
Some favorite verses. Deuteronomy 4:29: "But if from thence thou shalt seek the Lord thy God, thou shalt find him, if thou seek him with all thy heart and with all thy soul."
Isaiah 26:3: "Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee."
John 15:5: "...without Me ye can do nothing."
When we put all these together and practiced them, life was at it's best. If we want to win we'll have to do it God's way. In all of this looking back I've noticed that when we had devotions and prayer time together daily, our thinking was better, leading to better decisions, better actions, and better outcomes. When we lapsed in our devotions, selfishness got stronger.
Devotions and the better heart attitude that God's influence produces is a lot more effective than worrying, being depressed, nagging, complaining, and preaching, every time, I can tell you that. God Bless you both.