Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: You know you're in love when all you can do is smile whenever you talk about how he is to someone.
This tweet contains emotions: 
joy, love, optimism