So, we'll never see our loved ones again?

[Sal]

You position assumes that what is important, is *individuals*. 
We can (obviously) see, that evolution does not care about individuals, .. the larger universe does not "care" about anything.
Individualism (as a point-of-view) is prevalent in today's culture. That has not always been the case. 

It's actually not "depressing", necessarily. 
The lesson is, "show them you love them while you have the chance". 

The implication that one can make up a comforting reality to live in, is, of course, false.

"I do not fear death. I had been dead for billions and billions of years before I was born, and had not suffered the slightest inconvenience from it.”
― Mark Twain

But why should we assume that we were 'dead' before we were born? How can we be sure that the after life state is the same as the before life state? we could't have been dead, we just hadn't been born yet. 


And what about nature? If a plant can die and live again, why can't we?

The implication in Mark Twain's quote, poetically alluded to, is that "you" didn't exist before you were born, which is the same non-existent state "you" will be after death.