Hi confusedsue,

I'd like to join once removed and welcome you to the site. I'm sorry to hear that you're going through a difficult situation. Did you go to your mom for support because of his erratic behaviors? We can't diagnose, only a professional can do that! What we can look at are traits of BPD, can you give us a little more detail on those traits?
When he lost it while he was away from home, did you two have a conversation? Was there conflict?