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You can't expect to prevent negative feelings altogether. And you can't expect to experience positive feelings all the time. The Law of Emotional Choice directs us to acknowledge our feelings but also to refuse to get stuck in the negative ones.
Set yourself free from the past, bring peace into your life, and move into the present by letting go of your anger and bitterness. Get some balance, life is like riding a bicycle.To keep your balance you must keep moving.