How would Saitama cope with death of a loved one?

Since Genos seems to be the only one Saitama cares about or has something like a friendship with, I wonder how he would cope with Genos' death.

Is Saitama so far gone that he wouldn't care at all?

Does he get temporarily furios like missing a shoping sale but getting over it pretty quickly?

Or would he be actually grieving, raging, showing a wider palette of human emotions?

We never saw him in an truely emotional conflict yet, but I'd love to see this in the comic/show one day. What do you guys think his reaction would look like?