Man is a social animal. He feeds off other humans. he needs relationships to stay alive. He needs interaction and communication, of any kind to survive.
The problem is, these interactions and relationships are often just as detrimental to a person's survival as starvation or dehydration. Because some relationships sap your energy and peace of mind. They play with your head and make you forget who you are. They change you, fundamentally, on a core level. They make you doubt and question and lie and fear. They make you trust and believe. Worst of all, they make you hope, for more than you ever will get. They make you expect. And just as easily, they destroy your expectations. Kapow!
Relationships are a catch 22 situation. You can't live without them. And they destroy you when you are in them.