You should read the book "Boundaries" by Cloud and Townsend. Look it up on Amazon. It touches on these toxic relationships. They have another more specific book on the subject but the name escapes me...

Me-35

Together: 18 yrs
M-12.5 yrs
S-8
D-4
D'd: Feb. 2010

The LORD your God is with you,
he is mighty to save. --Zeph. 3:17