Task: Analyze the tweet's emotional connotations and classify 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 best portray the tweeter's mental state.
Tweet: Some 'friends' get bitter when it seems your life is moving better than theirs.
This tweet contains emotions: 
disgust, pessimism, sadness