Root Cause of My Feelings

My feelings have three modes: positive, negative, and neither. Then, what causes the shift from positive to negative? It's my desire, a force that permeates my thoughts, words, and actions. When I achieve what I desire, I'm happy. When I can't, I'm unhappy. This desire shapes my emotional reactions, driving me to chase happiness relentlessly. Feelings themselves arise dependent on contact; desire affects how I respond to them.