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So, killing someone doesn't matter unless you think it matters?

Correct. I've decided that it matters to me. The empirical evidence establishes that others have decided that it doesn't matter to them. Since I've decided that it matters to me, I get to claim they are wrong.

Because we will be separated from him forever. That matters to me, and him.

So, you see, you decide what matters to you. That's good. You get to decide those things. You are an active participant in deciding what matters, what has value, what morality means to you; it isn't a spectator sport.

Tell me, why should it matter to me?

It will matter to you because ultimately you will be where you wish you weren't and it will be too late to change it.
If it does not matter now, I am sorry, FRiend.