I know many churches have couples counseling. In our church they do it. Of course cause it is a Christian church (I don't know if other religions, or for that matter if all other Christian religions would be the same) but here they would encourage staying together (and marrying) if that can possibly be worked out.
As far as books go, I think a book that gave me a lot of insight into myself (cause you can only change your own behavior) was The Five Languages of Love. It helped me to realize why my husband said/did things I did not care about and felt like he was doing a great job loving me( I was doing the same to him). After reading it I realized how I needed to feel love and communicated better to him my loving actions to him.
Loving each other is not enough, you have to find out how to cooperate, be nice/kind to one another, as well as other skills that help.