Why do you build me up (build me up) Buttercup, just to let me down...?

i feel like a horrible person, nothing i say or do is right. nothing that comes from me will ever be good enough for you. i have come to terms with that. so i run from you. i do not wish to hinder ur life anymore than i obviously have already. i try my best to serve and love the best i know how, but with you i always fall short. I don't understand where i started going wrong. i don't understand why you insist on being in my face. please, just let me go, let me leave so your life can improve.