because you they know each other well, they understand each other like anyone could, because Sawyers love toward kate is enourmous, uplifting,because kate changed him, because kate is first person in the world of who sawyer started to take care.

because sawyer reminds kate her father and many other bad things and she knows he is a conman, he is a killer, but kate still loves sawyer…

because Sawyer thought that she was using him, Sawyer thought that he was not important to him but he still loves kate madly.

Thats why Sawyer and kate excellent couple❤️