Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
Tweet: Some 'friends' get bitter when it seems your life is moving better than theirs.
This tweet contains emotions: 
disgust, pessimism, sadness