The ZimZum of Love is a good relationship book. Rob Bell I think is a good example of a modern teacher with a great marriage (at least it seems that way).
http://www.amazon.com/Zimzum-Love-New-Understanding-Marriage/dp/0062194232/ref=sr_1_1?ie=UTF8&qid=1460124087&sr=8-1&keywords=zimzum+of+love