Yes I get that but you did something selfless for a person in pain.
So I don't think you waisted your time and when it got too tough you got out. At least in your case the zero contact was mutual.

I wish I knew what goes on in my case. It's so out of the blue. What was the trigger?
Is it just a sad story of a guy who's too cowardly to dump his girlfriend and just plays dead or is he in a bad place?

Nothing indicated this sudden stop in communication.

Did his mum convince him that I was trouble? Did he suddenly realize that by himself? Is he after someone else? Did he cheat on me and is his conscience killing him? I don't know anything.
I just want a straight answer and I don't know why he is too cruel to give it to me. I helped him to get home by lending him money. He was so grateful but not enough to be honest with me 7 days later it seems.

I've just written an email asking him if he was still alive. If he doesn't answer I will probably have to dump him.

My mum says I should announce that I'm booking a plane ticket to see if he's ok and that should scare him into answering. lol Not a bad idea. If I still don't get an answer, he's in a hospital.