Relationship changes

I have been with my husband for 12 years. He had life changing surgery last year which resulted in him having a permanent stoma, rectum & anus removal. It took over a year to reach this outcome but finally is pain free. He coped as well as could be expected & seemed much happier being pain free. He has received some new test results that he refuses to share with him and tells me he’s fine but he doesn’t know that I know there are further tests required on his recent scans . He has now told me that he doesn’t see a future for us and he doesn’t feel the same about me anymore, he feels empty & just wants to be on his own - this is not just home life but in general. He won’t or can’t open up or explain his feelings. We have a young son. I want to support him in any way I can, but he has become hurtful and resentful. I feel he is depressed and needs some help, to speak to someone about how he feels but he won’t entertain it.