Hi
nonbpdwife 
You are not alone, we are here with you and we are listening, we get it.
Are you receiving help for your ptsd? From what you say it sounds like your SO has had a break through recognising he needs serious help and ready to face his struggles with BPD. Has he been diagnosed? Is he ready to make an appointment with his Dr?
When you are ready, it can help to share some more of your story, so members can support you.
Are you able to take time out, a walk with nature, see a friend, family member?
WDx