Love. 

Neuroscience tells us it activates the same parts of the brain as habit-forming addiction. 

It makes us feel like we can do anything, be anything, achieve anything. 

And once we taste it, we want more. 

The thing about love is, when it's good, it's so very good, and when it's bad, it hurts so much.

 And if you can't find a way to balance all those ups and down, it will make you crazy.