I believe it is about "Justin" and his deep depression with a side of some sort of addiction. He would like his mom to be out of his life because as he tells her, than she can finally see what's good for her. When actually, it would just allow him to live in his depresssion, guilt free. Ultimately it's about his love for his mom and the guilt he feels. If she's gone doing her own thing than it's a win-win situation. He can continue being depressed without having the guilt of hurting his mom. So he thinks.