Honor marriage, and guard the sacredness of sexual intimacy between wife and husband. God draws a firm line against casual and illicit sex. Hebrews 13:4 (Message) 

Meditate on these following verses and personalize them. Don't focus on the current state of the relationship: "What she doesn't do"; "What he did"; "She doesn't trust me"; "He takes me for granted"; "She's always complaining"; "He's only intimate for sex";  and on and on. These may be valid thoughts and feelings, but what we dwell on we empower to grow. You cannot "change" someone else but the word can change you both. See what the word declares as spiritual truth that is coming to be naturally seen as you draw it out with faith. Speak healing, forgiveness, and renewal. Speak, believe and stand. You may be directed for a faith filled action or faith filled silence. You will know. Let God flow.

He restoreth my soul: he leadeth me in the paths of righteousness for his name's sake. – Psalm 23:3

There is such tremendous depth in this entire psalm but in these writings we are focusing on the faith building aspect.  For faith to be effective, our hope and expectation level must stay strong. Issues of life and health can certainly weary us over time.