That's a good question. Why do you think you do it? So you can say "neener, neener, neener, I was right about you all along"?
Does it really matter at this point what he is doing and why?
Keep yourself busy with YOURSELF ..... have fun by yourself, do something you enjoy. He is doing what he enjoys and you need to do the same.
If you are checking up on him, you are not detaching and you are not following the steps. Let it alone and get busy for YOURSELF.