Hello Kate.
I would think personally that with the results your husband has been given it is unlikely he will not require treatment so I think he is in denial.
PSA between 6 & 7 isn't high but the fact that the first figure is 4+3, together with the staging makes it more serious, but there will be options available to him.
That won't make it easy for you, especially as he isn't letting you discuss it with anyone.
At least you have us so you are not entirely alone in this. We all know what it feels like.
This is a massive thing he is going through, and you too, so it's understandable that he just doesn't want to talk about it. Bear with him for now. Once the scan and the results are pout of the way it will all become more real to him. Just give him a little time. He is probably worried about surgery and the possible after effects.
Keep coming back to us and if we can help - we will.
All the best
Sandra