(noun) A compulsive or irrational preoccupation.
"He did not care if she was heartless, vicious and vulgar, stupid and grasping, he loved her. He would rather have misery with one than happiness with the other."
"I have little left in myself -- I must have you. The world may laugh -- may call me absurd, selfish -- but it does not signify. My very soul demands you: it will be satisfied, or it will take deadly vengeance on its frame."
"I would like to be the air that inhabits you for a moment only. I would like to be that unnoticed and that necessary."
"I desire to be with you. I miss you. I feel lonely when I can't see you. I am obsessed with you, fascinated by you, infatuated with you. I hunger for your taste, your smell, the feel of your soul touching mine."
"I love the ground under his feet, and the air over his head, and everything he touches and every word he says. I love all his looks, and all his actions and him entirely and all together."