It's easy to see the many ways that relationships -- whether with friends, family members, coworkers, or significant others -- add value to our life. In a healthy relationship, both individuals give and receive love, affection, kindness, compassion, advice, and support. Both invest the time and energy to make the other feel special and acknowledged. Neither takes the other for granted or bolts at the first sign of trouble, whether in the relationship or outside of it. A toxic relationship, on the other hand, is suffused with negativity and riddled with conflict. Distrust snowballs into deep resentment. Lying, lambasting, and lashing out become par for the course. While occasional arguments are normal in a relationship and can be beneficial in the sense that both people learn to work toward achieving common ground, too much fighting can escalate to the point where (1) both individuals are at each other's throats (2) they grow so disillusioned that they stop caring altoge...