marked by erratic changeableness in affections or attachments; "fickle friends"; "a flirt's volatile affections"
faithlessness: unfaithfulness by virtue of being unreliable or treacherous
There is more than one way of being and acting fickle. You may not call yourself fickle but others would might not concur. It is not as subjective either. There are mores, morality and very objective questions. I wouldn't want to be called fickle but, I do agree that there are standards of conduct that keep fluctuating in my head. I would behave in a certain way at a particular point of time which I otherwise wouldn't. I cultivate guilt and feel awkwardness in my throat while trying to swallow my own acts. The throat becomes thornier when I see others easily swallowing the things that are not permissible under my psyche.
Double standards are readily attachable to fickleness. You are so fickle when you do it, but it's ok when I do it. I am an honest hypocrite. Now, what you gonna do?