Laughing, You've not lost your son. He's still very much your son deep down inside. Right now, he's having to deal with a lot of things and he's got to figure out what is reality/truth and what are the fantasies/lies that have been tossed at him.
With Dick in the room, he couldn't very well show you that he was still very much your son. He had to put on a "front" to convince Dick that he was a "man" now and could deal w/cutting the ties that you have w/him.
Laughing, I know that you are confused and hurting right now from that phone call, but give it some time. He's not been gone long enough to miss everything that was so near and dear to him. The holidays are coming and he will think of you, your daughter and home. He will think of his friends, etc.
It sounds like he's hitting a bit of depression if he's isolating himself from others. I feel for him because he's caught between two zones of life.
I am keeping you and your family in my thoughts and prayers. Do not give up, no matter what you think at this time. Have faith that God will turn this around and soon.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.