Knowing your attachment style will help set you up for healthier more intimate and successful relationships. 

To find out your attachment style you can take this assessment made my Diane Poole

https://dianepooleheller.com/attachment-test/

Her book on attachment is also a great read, The Power of Attachment. 

Another great book to understand your attachment and others is Attached by Amire Levine. Then follow that with Richard Schwartz book You Are The One You Have Been Waiting For so you can begin to heal your attachment.