I have a very hard time letting go of resentment towards a very close friend of mine. I have been told by him that on numerous occasions that I am negative, I complain a lot, I am not happy, I don't show that I care, etc.. He has told me he does not want to be around me anymore and I don't blame him. I am in a vicious cycle of resenting him for giving me constructive criticism, but I know they are true. Instead of doubling down and working on myself, I sulk and get mad and upset with him for bringing it up and that prevents me from being the friend I should be. From being happy with myself. I am always angry and I can't seem to let it go.