Apathy.

-an absence of emotion or enthusiasm
-the trait of lacking enthusiasm for or interest in things generally
-the lack of emotion, motivation, or enthusiasm.
-a psychological term for a state of indifference — where an individual is irresponsive or "indifferent" to aspects of emotional, social, or physical life
-a state of not caring; not wanting to know; complacency; indifference; to ignore; disinterested in contemplation; anesthetized by popular culture; a postmodern intellectual narcosis; compassion fatigue; too lazy; too busy; self-indulgence; non-reflection, non-deliberation and subconscious blocking of distressing information.

apathy is a pain in my ass. it can ruin what otherwise would have been a tremendous event, outing or experience. overcoming apathy is the hardest. putting indifference aside, while not knowing what catalysed the state of indifference, is near impossible. and a struggle. try empathise with the unpredictably apathetic, its not something we choose.