The key to staying in love (or to feel in love again) with your spouse: 

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“Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is commendable, if there is any excellence, if there is anything worthy of praise, think about these things.” Philippians 4:8 ESV
What we think about determines how we feel. If we think about all the things our spouse does wrong we will not feel in love but if we think about the good in them and what they do right, love will flow naturally!!!