What does he want?

Ask him casually that you noticed he goes for longer period is he feeling more down than usual. But i dont know what type relationship u have with him.
As introvert I can disappear for half year or year. If i can't see person in face to face i dont really see that much value in chit chatting for bunch of nonsense seems like waste of time. I enjoy spending time in person. So i just make new friends wherever i go and let other friends go their own way.
I didn't tell any of my friends that i dont want to talk to them ever. Because its not true I dont have bad relationship with any of them. So im not sure if that is proper approach that you want from him its more emotions speaking rather than logic.
Before telling you what I think you should do, tell me how would you handle this situation if you were in his shoes and you needed disappear for some unknown time? What would you do? What kind message would you send to yourself?
Thats okey message i guess. To me it sounds like someones about to commit suicide tho. And leaves me worried and stressed.
You can just send him some message here and there, i remember went i need break its not like i block them its just maybe go instead for everyday chat to once a week chat.
Why you still care about this guy, that long, i dont know
Opinion
3Opinion
he's not really interested in a relationship
Just take things slow with him
Yeah, you should ask.
Superb Opinion