I'm going to tell my friend's girlfriend that he is still smoking even though he's been telling her for the past year that he quit.
Why would you tell your friend's girlfriend this?
I want to use my power to share his secret. After all, the truth will come out sooner or later.
I get where you're coming from, but it's not nice to just expose your friend's secrets. You shouldn't pry into his life so much.
My friend used to be a smoker before he went on a date with her, she doesn't know he started smoking again.
I get that you don't like that your friend smokes and is keeping it from his girlfriend, but it's really none of your business and you shouldn't rat him out. I would consider talking to your friend and encouraging him to be honest with his girlfriend and also work to quit smoking, as it's important to his health.