Amir Levine 
Attached 
The New Science of Adult Attachment and How It Can Help You Find – and Keep – Love (Highly Recommended by the Author of Beyond Mars and Venus)

In the book, Attached: The New Science of Adult Attachment and How It Can Help You Find – and Keep – Love, Amir Levine and Rachel Heller explain their understanding of adult attachment which is also a cutting-edge scientific result of intimate relationship science up to now. They divide attachment into three categories: The anxious attachment type: They are often addicted to intimacy and often doubt whether their companions can give back the love same as that of themselves; the avoidant attachment type: They equate intimacy with a loss of independence, so they often try to weaken intimacy; The secure attachment type: they like intimacy and are often warm and loving. By understanding the attachment tendency of ourselves and our companions, we can find true love and manage our intimate relationship well. In the book, Levine and Heller guide people in detail how to confirm the attachment style of themselves and their companions, and guide people to establish a stable and substantial relationship between them and their lovers.