friend with leukemia...idk wat to do "/ *please answer*

ok so in my last question i asked about if i was going behind my parents back with my best freind...and i had put how he got cancer...hes 15 and im 15 last year around december he got diagnosed with leukemia and all of us gave him advice and would try to cheer him up but his hair just now started to fall out and even though god healed him of leukemia he still has to get chemo. for 3 years so anyways his hair started to fall out (cuz of chemo.) and he didnt want to cum to church anymore and was mad at god for letting it happen to him and i reminded him of Job abt how god was testing him by taking away ALL he had nd how mabey gods doin that to him or tryin to lead him back to god...but hes still very sensitive and cant get sick and me and his sister kinda passed our cold to him and hes back in the hospital nd he siad how he feels like crap and feels like dyieng i dont really know what to say to that and he comes and asks me for advice alot cuz im his best friend thats a girl...so if anybody has some advice on what i could tell him??please?? its really important