Hi and welcome. I hope you do not mind, I ran your post through google translate as we use English on this site. I am not sure how many people here are fluent in French and I wanted to be able to reply.
Anyway, I am glad you reached out for help and decided to post. You will find that we are a supportive site where many other parents post to share and get help, advice and just have a place where people understand.
You have been dealing with a lot!
It is very difficult and painful to watch your child destroy himself like this.
Yes, it is heart breaking to watch a loved one do this, I can't imagine watching my own child go through this. (I am here because of a disordered parent)
What sort of support system do you have, other than here? Friends, family?
I hope you share more and get comfortable here. In the meantime we have a lot of articles that you may find helpful. They are tacked to the top of this page. We talk about communication strategies, self care, understanding BPD behaviors and how they manifest in our loved one. Check them out and see which one you want to talk about.
I hope to hear from you soon.