22-year-old son has been in the basement, jobless, for two months

Here's the back story: at age nineteen my son went to college, got depressed, failed his courses and was having a hard time. When he got home from school and was living at home, he would stay up late, sleep in until 1 pm, and not do anything. My wife started to yell at him to go look for a job and he freaked out and said he was going to kill himself. We sent him to live with his grandfather, where he stayed for two years, got a job, exercised, ate healthy and seemed to be doing fine. He had to move back to our place because his grandfather moved. He then went back to school for a semester, worked full time and got good grades. Now it is summer and he stays in his room and avoids contact with us because he wants to be independent. He hasn't worked for two months now, has no money, and avoids us. I took him to lunch and he said he was fine and wasn't depressed, but I'm worried about him. My wife thinks he is "giving us a song and dance" and may be depressed. We are at a standstill. He rarely answers our text messages and says he wants us to leave him alone. He does get out with friends, but uses the basement exit an his room door is locked 24/7 so we don't know if he's home or not. He has his own kitchen but will periodically get food from us. via /r/Parenting http://bit.ly/2IGrfx9