Hi Cherry,
There just isn't a "one size fits all" emotional response to cancer.
I, personally, am inclined to bury my feelings - kind of put them on a back burner - and focus on "doing" things, kind of dealing with what needs to be dealt with. That's o.k.(ish) - taking a pragmatic response - but it then usually leaves a whole lot of unresolved feelings about it all which eventually kind of pour out and swamp me and put me in a rather dark place from time to time.
I sneakily suspect that perhaps your OH is kind of trying to protect you from upset and worry. I can kind of understand that, but he probably would be better off trying to walk this particular path with you.
But, some will find it easier to talk about these things than others.
There can be a lot of anxieties and fear, some more justified than others. Many of which, perhaps not all, will feel less fearful after they've been addressed.
I hope you can get him to either open up a bit to you about it, or find someone who he is able to talk with it about.