Hi Cnm
I would like to join
NorthernGirl in welcoming you here. You are convinced your son has BPD and also mention that he has been in therapy for a year. What kind of therapy is he getting and do his therapists share your suspicions of him having BPD? Why did he start with a new therapist two weeks ago?
Getting a text like this at 11 PM isn't pleasant at all. Has your son ever made such statements before indicating he can't find any hope for the future? Your son says he wants to quit swimming but feels trapped. Has he said why he feels trapped? Do you know if he feels pressured by anyone to keep swimming?
I understand why you would feel like you don't have the skills to handle this (yet). Like
NorthernGirl rightly pointed out, none of us are born with the knowledge and skills to deal with this challenging disorder. We gotta learn this as we go along. You might benefit from taking a look at the lessons for parents of a child with BPD:
LESSONS: What can a parent do?Take care