Not alot you can do to "make it better". Let him know you appreciate him as a friend and let him know you'll be there for the fight.
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Heart breaking
He is lucky to have someone who will cry with him and for him. I encourage you to continue to be in that simple spot for him. There is NOTHING more important.
The best advice I can give you, "listen, really listen to him."
There's likely little you can say anyway, but someone that's listening to you and your thoughts/fears in a time of genuine need may be priceless.