No, you just have to want to change how you feel. It is said that a justified resentment is the worst thing for certain types of people, so that would be a perfect example. All that's required is you don't want to feel that way anymore. I highly recommend the DBT diary card app, it really helps between classes. Problem solving is for when your feeling is based on the facts and you don't want to change it. Opposite action is for when your feeling is based on the facts and you do want to change it. I've had to do both on some very difficult situations .

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