unhealthy relationships

The Stanford professor and author of The Asshole Survival Guide explains how we get confused—and why we need to end certain relationships. (Yes, he uses the a-word, but his points are scarily good.)
Toxic means poisonous, damaging or deadly. A toxic relationship drains the life from you, damages your self-esteem, or kills your dreams. While this sounds deadly, toxic relationships can be subtle and do vast harm before we realize it.