Analyze the tweet "When you burst out crying alone and u realize that no one truly knows how unhappy you really are because you don't want anyone to know" to classify the intensity of the emotion sadness. Your options are: 0: no sadness can be inferred, 1: low amount of sadness can be inferred, 2: moderate amount of sadness can be inferred, 3: high amount of sadness can be inferred.
3: high amount of sadness can be inferred