If a person who supports bad habits and destructive behaviour is an enabler, then a person who is unable to support these negative traits due to morals, a physical lack, or some other constraint is therefore an unabler. If you refuse to play into negative behaviours on someone's part then you are an unabler
Sorry to be an unabler, but I can't give you a cigarette I quitsmoking too.
Being a bloke I have to say this is actually what GIRLS do. They feel the need to play "hard to get" and therefore don't text back, though usually it'll be after a couple of texts so it doesn't look too obvious.
Me: I was texting Becca earlier
My Mate: Cool, how'd it go?
Me: Ok for about half an hour, then she turned on the old unable-to-text-back syndrome
My Mate: Tut, of course...
Person 1: Has Sam texted you recently?
Person 2: Yea, her textingquality is so bad!
Person 1: Well, she's pretty stupid so that probably affects her unabletotextness.