How do you process loss/grief?

I got woken up at 1:49am to the news that one of my best friends, my ex, my soulmate had passed and I still don't think I'm fully processing it. He just called me Saturday morning. I was in the middle of something so I told myself that I was gonna return the call. I forgot. That was Saturday. And today he's gone. I think I'm on shock. I've loved him since we were 15 years old. He can't just be gone. What the fuck do I do now? My heart is literally shattered.
How do you process loss/grief?
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