Your brother obviously loves you and deep inside is supportive but so disappointed. He will not truly believe anything you have to say right now as he has been covered in bullshiit so many times before. It is SOOOO very typical of us addicts to become incredibly remorseful when we get caught. We breeze along as if nothing and no one can stop us until suddenly it hits us right in the face. Then we SUDDENLY realize all the crap we have done and lies we have told and those we have decieved - HOW COULD I HAVE DONE SUCH THINGS. I AM SO SORRY.
On the outside looking in it is just a load of predictable, repetitive crap and is quite meaningless.
We are a manipulative bunch we addicts and when finally caught face to face we twist and turn all those we know to try to repair what we can.
We can say what we say but in the early days it really doesn't mean much as we try to manipulate others and ourselves to believe that we can overcome what we have done.
Go through the withdrawal. Eat the shovel full of shiit. Live through the pain and come out the other side. Then and only then can you truly tell your story and expect to be believed.