How do I stop feeling bitter and resentful towards partner and loved ones?

How do I stop feeling bitter and resentful towards partner and loved ones?
I don't know, whatever they do or say I just get bitter. If they do or say something good for me, I wonder where the screw up is. If they do or say something bad, I engrave it in my memory and get resentful about it.
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I'll be honest, I'm starting to consider my fiancée, my mother, my sister and my ex an Axis of evil without whom I wouldn't be so miserable.
How do I stop feeling bitter and resentful towards partner and loved ones?
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