I really enjoyed 5LL. I only wish that I had read that years ago. It has a quiz in the end (also on their site) that lets you figure out what your LL is and also your spouses. Reading the book opened my eyes on what my H was not receiving. And when I thought I was showing him love, he did not see it the same way. H even took the quiz online and I was dead on his LL's, but as I said, I didn't know before.
Another book I'm reading right now is "Solo Partner". It talks about how one person CAN save a R, as well as the distancing/pursuing thing.