Rihanna didn't write the song, Justin Parker, Mikky Ekko did, so I'm highly doubtful it's about Chris Brown
Not every song in the world is about drug use, most people in the world are capable of having profound experiences and emotions [both good and bad] without the use of drugs or alcohol.
I think it's about two people struggling with intimacy and the sense of vulnerability that comes from realizing you need the other person as well as how fear can cause you to sabotage something you want so badly. That fear is causing her to distance herself out of an unneeded sense of protecting herself and he's calling her on it, reminding her that she needs to be open to receiving love and living life:
"It's not much of a life you're living
It's not just something you take, it's given"
And she's admitting that even though she's still struggling with the fear:
"Not really sure how to feel about it
Something in the way you move
Makes me feel like I can't live without you
It takes me all the way
I want you to stay"
Her need for him has outweighed that fear of vulnerability"
"Oh the reason I hold on
Oh 'cause I need this hole gone"
Just a few thoughts:
I think it's about two people struggling with intimacy and the sense of vulnerability that comes from realizing you need the other person as well as how fear can cause you to sabotage something you want so badly. That fear is causing her to distance herself out of an unneeded sense of protecting herself and he's calling her on it, reminding her that she needs to be open to receiving love and living life:
"It's not much of a life you're living It's not just something you take, it's given"
And she's admitting that even though she's still struggling with the fear:
"Not really sure how to feel about it Something in the way you move Makes me feel like I can't live without you It takes me all the way I want you to stay"
Her need for him has outweighed that fear of vulnerability"
"Oh the reason I hold on Oh 'cause I need this hole gone"