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anger and sadness.
Part of what makes bitterness a complex emotion is that it also includes disappointment, or the experience of having been disappointed as a pattern of behavior over time. Disappointment, is a complex emotion, too, because disappointment involves sadness, but it also includes other layers. If you think about disappointment, you realize that anger may be in that mix, as well (feeling angry that things didn’t work out better or that your particular needs did not get met).
How my heart sings 