Even though I’ve written two novels, I still feel a bit clueless when it comes to structuring one. I find the middle particularly hard to deal with, especially when trying to incorporate a romantic relationship into the story. So I went hunting and found this cool post about the seven story beats in a romance novel: http://kayedacus.com/2008/04/28/writing-the-romance-novel-the-seven-story-beats/
Hopefully it will inspire you and help you develop a stronger and more consistent story.