I don't know what to do

My two best friends moved to the UK in 2020 and now moved to America last year, and that was hard for me. But now I find out my only real best friend that still lives here is also moving to America like they always planed but I don't want to burden her by saying how upset I am that she's leaving, because she's not only leaving soon or someday she's going at the end of July and I only heard last night. So really I just needed someone to vent to.