@Peach201 if he wants to see the nurses/doctors alone, I suggest you comply. It must be very difficult for you, but keep in mind it's not easy for him either.
seeing these people alone maybe the only autonomy he has left. When he gets/has got the really bad news, perhaps he just needs/needed to face it alone, before he shares it, if he ever does.
I'm so sorry if this sounds harsh, I'm a long term survivor of three rounds of different cancers, so I say this with a deep sympathy for all your suffering.
each time I got my diagnosis, I insisted I heard it myself, alone at first, although my adult child had gone with me. I wanted to hear the diagnosis alone, not because I didn't love my child, but because I did. I needed maybe a few minutes to concentrate on how I felt, without worrying about my child's needs.
I'm sorry you and your loved one are going through this.