Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture 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