When you look into a broken mirror, you get a shattered view of yourself.

What Wayne could be saying is when he looks into a unbroken mirror, he is unhappy with what he sees in himself, probably his drug use. But when he shatters the mirror, or breaks the image he hates seeing, he gets a view of a new Wayne and a new life where is mother is more happy with his positive changes.
“I see the change, I see the message” is a reference to a famous quote by Gandhi, “be the change you want to see in the world”