I would recommend His Needs, Her Needs by Willard F. Harley. It changed by whole outlook on love and marriage. Marriage is a relationship of extraordinary care. Pres. Hinckley said something to the affect that he is convinced that a good marriage has one undelying principle: That it's not so much a matter of romance but an anxious concern/care for the well-being of the other. That's not to say Romance isn't a worthy goal to strive for, but you're missing the mark of what marriage has to offer. My wife says similar things to you. She says she loves me like a brother. THat the 'eros' is missing. Since that time I have done my best to go out and MEET her most important emotional needs. That's love. Meeting NEEDS. Physical needs, emotional needs, spiritual needs. Giving the best of yourself to the other person, and a healthy marriage has that recipriocated by the other spouse and is usually done in a completely different way. If you want the 'SPARK' in your marriage you needs a phD on your husband. Study him, study other males, study out what his likes and dislikes are, what he values, what concerns him, what fears he has. Then UNDERSTAND how HE sees the world and what he needs from you and give that to him. As you 'prime the pump' you will likely see a softening, I have, it's never fast enough, but it happens. It will happen. Keep doing it, and be open and honest and patient with him. I guarantee as you draw nearer to your spouse as well as Christ you will find that 'spark' in your marriage. You can't draw near unto Christ by neglecting your spouses needs that only you can meet in Marriage. And you can't really meet your spouses needs in marriage without being closer to Christ. Work on those two relationships simultaneously and you will see a shimmer of hope, and rather soon. Don't let Satan squash it either.