Surely you have some degree of stuff you do for him that is in excess of what is legally required of being his guardian.

I'm not parent of a teen, yet, and I know things are difficult to implement (it caused enough angst to restrict and lock down my 11 year old -- it certainly wasn't the most painless option in the near term).

But you don't want to keep heading towards an inevitable cliff... fight the good fight. I wish you the best, and I'm sorry if this is tonedeaf and naive.