Trying to predict what a 'male' wants/needs/expects from you is a challenge at the best of times... let alone when us males are sick. communicating directly is usually not our best suit. And, of course, some folks are better than others when it comes to dealing with sick people. like, some feel that they don't know what to say or do, and end up feeling uncomfortable and awkward. That is just normal. I also know from personal experience that the best intentioned people can find themselves feeling guilt, or fear, or withdrawal; cause 'they' can't fix it.
All of these things can come into play. like, I know as a male I have my mood swings (testosterone, don't you know), and pred can make those go bizarre. But there are also subtle, little differences in the way people behave around me that make matters worse, rather than better. For example, if someone says "Gee, you look terrible, are you feeling worse today?" isn't good to hear when one is trying to forget about their illness for a moment. better to hear "you look a little down in the dumps, anything I can do to cheer you up?" That changes the inflection... like, that is something someone can say to anybody. It can't be (or least is less likely) mis-interpreted as meaning "Are you still sick? I am getting tired dealing with your neverending illness" And sometimes, I can be thinking of something... a sad memory, a bad thought, just in passing.. BUT if it evokes one of those responses from a loved one more reminiscent of what a nurse in ICU might say to a failing patient... then all of a sudden, instead of that sad, non disease related moment, I get a reminder of my health issues + whatever the thing was that had me looking glum, pained, etc., whatever. It just compounds the problem. There is no short course in dealing with disease, but I think there are general support groups who might be able to help you to cope with the prescence of this in your/his life, let you recharge, vent, etc.. It may also prove helpful in providing you tried and true formulas for coping ,etc..
And, sit down and have a serious conversation about this on one of his 'good' days. This disease, like any other, rarely kills, but it can kill relationships. The disease is here for good, and perhaps you too need to 'determine' that you're both going to be there for good.. Bear in mind that he is only human, that its tuff to deal with this disease, and that it will cause times (hopefully short) when coping with the disease for himself, by himself, is all that he's capable of at the moment. Believe me, I've had those... When I simply just didn't have it in me at the time to reach out to anyone, no matter who, no matter why. I just didn't. It is a hard thing to deal with/accept.. doesnt' change the fact that it happens. If I have been of any help, great. If I scared you I'm sorry. If you listen to an old fart like me, then you really do need help, and do so at your own peril, okay?