(((((((((((((Can't Stop Crying)))))))))))))

From the descriptions you've given, I don't think he is anything like a "sociopath." Feeling numb, withdrawn, and disconnected from people is common in depression. Maybe you can encourage him to discuss this at his next T appointment?

In the meantime, you are doing the best thing you can for him by listening to him. Since he's going to you, he still wants help. He wants to get better and he wants to connect with you. You are doing a great job.

It must hurt to hear your son say that he thinks about dying and suicide so often. He's so young, and it's awful that he has to go through this. You do need to take care of yourself, too. You can't provide 24/7 intensive mom-therapy!

How often and for how long does he talk to you about it? Is it possible to let him know that you're there for him but also limit the time you actively talk about it? If you check in with him more frequently is he less desperate when you talk? I don't know if any of this is helpful. Does your T have suggestions for you about self care?