Seemed like he was quite involved w his therapy then but seems to be back sliding.
That seems to be a common pattern. Therapy can be scary for someone who feels overwhelmed and flooded by intense emotions. It is often two wobbly steps forward one big step back and so on. It's a good sign that he is open to therapy and that he is willing to try again.
The DBT has not started.
It's hard to wait for these things to get going when your heart is in your throat and things feel so urgent. There is a good book you may want to read called Buddha and the Borderline, a memoir in which a woman with BPD goes through DBT. I found her reflection on DBT to help me make sense of the way it works and how it might feel for someone going through the skills.
It can also be helpful to order a workbook so you can become acquainted with the same skills, and at least know the language or be curious about it if your son is open. If not, the next best skill to learn is validation. There are many wonderful friends here who can help you walk through that new terrain if it's new to you.
Glad you are here
LnL
