Bitterness, anger, envy, jealousy, wickedness, etc. will not better a person. In fact, they are blockers. They are blessing blockers, friend blockers, love blockers, just to name a few. Harboring such negativity and performing wicked acts can block the flow of great and positive things from happening in your life.
One might find it hard to let go of such emotions, but there is help. Jesus is our Helper. Jesus has the power to do what we cannot do. He can uproot every negative influence that has caused you to believe these experiences have control or power of you. Do not let these blockers remain in or become a part of your life.