Worried about DS

[Hearthurts]

I'm just after some advice to anyone who has been through similar.
DS is 20 and up until last week I thought he was happy with life, has a good job and goes out with friends.
I bumped into his ex last week, they are still friends, she said she has seen him recently a few times, he's been crying, saying he can't go on. She thinks he needs help. she said another one of their friends has also been having heart to hearts with him and they don't know what to do as he's so down.
I'm just devastated, he has seemed happy at home. How can I have missed this? I've cooked him tea tonight and asked him if he's ok, he insists he's fine. He's been in his room ever since watching tv. Doesn't even want to come down to watch footy.
Also,to add, in the summer I found some drawings he had done. They were very macabre, daggers, death, phrases from songs about love and death.
I'm so worried, I don't know what to do.
I posted in mental health but didn't get many replies.

I'm sorry, I don't have much experience or advice for you but just wanted to send some support. I remember feeling totally lost in my early 20s, living at home, had no money, had broken up with my boyfriend, and no idea what I wanted to do. It all felt overwhelming, but things did improve hugely over time. It sounds like he has a very loving and supportive family and that will help him a lot. Do you feel that you could mention that you have spoken to his ex? It might help to make the first move?

Thanks for replying. I'm not sure if mentioning his ex will make it worse, he might feel betrayed and I've got a feeling he will clam up if he knows we've been talking about him. I've just made him a cup of tea and gave him a hug, I asked him what's wrong as he's not himself. But he just says he's fine and going to his room to watch a film. I just know something is bugging him.