All you can do is be there for him. Be a friend to him just like you would anyone. Let him talk, just listen to him, then just talk about normal things. Ask him if you can do anything for him.
i have a friend i met online and he is going though a lot. He lost his best friend, a lot of his online school friends gave up on him, he has broken his ankle and much more. Idk what i should say or do? Anyway how should i help him?
As you met him online, you cannot do a lot to help him! Just advise him on things and comfort him when you both are talking! Tell him not to stress and calm down and everything will be okay!
Tell him to go to a web site called thehopeline.com. They have resources that can help.
I think this boy is very lucky to have a friend like you and the fact that you care enough to come on here and ask advice tells me that you are doing all you can for him.
Just be there for him and offer support. If he wants to talk about his problems then be a good listener, if he wants a break and a change of subject, then tell him about your day and maybe a funny thing that happened which will hopefully cheer him up and take his mind off his problems.
Maybe send him an ecard or a funny poem, just try to brighten his day in little ways that he will appreciate. Just knowing that you are there for him will mean so much though.
He may have lost his best friend, and I am sure he is very sad about that, but it seems to me he has another very good friend in you and unlike his school friends, you don't appear the type to give up on him.