How to get over unrequited love/strong years-long crush?

As the title says, how can I (28F) get over an intense crush I've had as long as I've known someone? His life is chaotic and he is abroad so he barely responds and doesn't acknowledge my feelings. Or at least not yet. I deleted our chat and unfollowed on insta and feel terrible. He is still my friend and I still worry about his safety and care about him but it's unhealthy. How can I get over this?? I'm hoping by posting here this time i can get some extra advice from anyone that has been through this.

tl;dr i've had a crush on my friend for as long as i've known him and need to move on but don't know how