It does sound like he has a lot to work through if he is not giving her space even though their relationship is over.

As far as his possessions, it's hard to say as we don't know him as well as you do. Follow your mom gut feeling and just be there if he needs to talk. Does he open up to you at all? Maybe just let him know you're there if he needs to talk. Let him know you are safe. This is a different truck than he got stolen or did he get that one back?

Good luck and let us know how it goes.