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I lost my great-grandfather and father to cancer, and you're right. It won't be okay. The thing that's the worst about watching a person suffer through such an awful thing is the pain they go through and knowing that there is literally nothing you can do to fix their pain and suffering. Let your boyfriend know that when his uncle finally passes, he is no longer suffering. The pain and endless torture of the cancer is over and he doesn't have to feel the pain anymore.

That is knowledge that can put your mind at rest. Your fiance will still be upset about the loss, but all you can do is be there to listen to him and give him some love. Maybe make him his favorite food or watch his favorite movie. Try to keep things calm and familiar. Those are the things that'll be most comforting in the end. When he wants to talk about his uncle, try to get him to remember the good things about his uncle and the good parts of his uncles life. That way the death won't seem like it was for nothing. If you let him know that his uncle lead a happy fulfilled life, it'll ease your fiance's mind.

This stuff is so hard to deal with emotionally. Just be there for him. It's about all you can do.

I'm super familiar on loosing family members to cancer, My own brother died of brain and spinal cancer. I've know too many others to die of cancer. comforting someone doesn't come easy to some. You know what? sometimes saying nothing is best if you don't know what to say, but being there, listening, putting your arms around him and just telling him you're there for him,,,,is huge. Don't say you understand though because you don't. Don't tell him it will be alright because you already know it won't. just be supportive, listen, listen, listen and love him

Just pray and stay by your fiancé side every step of the way

Let him know you are there for him. Let him talk to you if he wants to. Its a hard time and he might just want to seclude in himself though.