"I want you to get swept away out there. I want you to levitate, I want you to sing with rapture and dance like a dervish... I know. It’s a cornball thing, but love is passion – obsession – some one you can’t live without. I say fall head over heels. Find someone you can love like crazy and who will love you the same way back. How do you find him? Well, you forget your head and you listen to your heart….’Cause the truth is, honey, there is no sense living your life without this. To make the journey and not fall deeply in love…well, you haven’t lived a life at all. But you have to try because if you haven’t tried, you haven’t lived."

--Bill Parish (Anthony Hopkins), Meet Joe Black

The sad part is when you're obsessed about them and they know it and the feeling isn't reciprocal and then you have to learn to detach yourself and accept things the way they are.