My son left... Sent me a song... And blocked me... Update

My son is gonna and Idk if he's coming back.... He has been the man of the house for 5 years. Since he was 14. My husband left me and I got depressed. Severely depressed. I made my son my therapist and he took care of everything. I haven't worked since in almost 5 years. My son took on many jobs to pay our bills, learn to do taxes. Did everything to take care of me since I was have been depressed. I lean on him for my support. He broke down one day and told me he's tired of being strong for me and he wants a mom who will hold him and let him cry and be weak for once because he's tired of being strong and holding everything together. Today I came home and his Xbox was still there but all his clothes were gone. Books. Gone. Laptop. Gone. Even stole some food from the fridge. I texted him and called him. He ignored and just sent me a YouTube song lyric music video of the song Immortal by Evanescence... Then blocked me.. I didn't even listen to the song. I've called everyone trying to find him. Either he told no one where he was going or they're lying for him. I went driving to find him and can't. He gone.. And I don't think he's coming back

Update: So my sister knows where my son is. I just found that out. She says he's left completely but he's safe. When I begged her to tell me she said no and that if he wants me to know where he is then he will tell me. She also said I need to start acting like a mother. My sister told me since my son was 14 I turned him into a husband and I treat him as such. She thinks I may have screwed our relationship forever because I caused him trauma by having him pretty much take on a husband role and that I need help. She is probably the 6th person that called my relationship with my son emotional incest...