I lost a friend and can’t shake the feeling

I was playing on a new MC server and was hoping to have a fresh start there. I then made a friend on the server and they felt like a genuinely funny and kind person, almost like I knew them irl. But then a couple months later, and they started to play less and less, and at this point I got a little worried. Thankfully, I calmed myself, and laid it down as a normal thing. But I eventually quit for like a few weeks to do other things, and I came back to a notice from them saying that they quit and I checked my discord and, sure enough I couldn’t text him anymore.

Now, every time I log on that server I get more depressed and miss them even more. They were the only person on the server that didn’t seem like a copy and paste. Please tell me how to cope with such a lonely event like this.