don't know how to react

Mr
I've never lost anyone in my family. My husband on the other hand has dealt with this multiple time. Mostly family member that he met a handful of times when he was younger. But right now his aunt is struggling with chemo and cancer. She's been in ICU and they had to revive her with CPR today. I'm upset by this and emotional, I only met her twice, but love her. And my husband says he's "ok, I guess". I just don't know what to do or how to react around him..like I said I've never dealt with this before..