They didn’t know how to deal with losing him. They were both very intelligent and logical people, and therefore were perfectly aware of the way that life and death worked, but neither of them could wrap their head around the fact that he wasn’t going to walk through the front door at any minute, or that he wouldn’t be calling to apologize for his tardiness. They were never going to see his smile again. They weren’t going to hear his voice again. He was dead. That’s it.
They had to comfort themselves, and each other, but they didn’t know how.