Just make sure that whoever you find to be your next best friend, you dont depend on them as a 24/7 therapist too much. (not saying you did that I just know people that have done that to friends of mine and driven them insane and dragged them down too). I hope you find a better best friend and find yourself out of your depression soon :)
And lemme tell you from an experience I earned this year near the end of freshman year, the fear is amplified once you've been broken up with someone you'd fallen in love with. Really hard too. (and yes I'm over him I found someone better so fuck em amiright)
Siblings
Grandparents
(Basically all family)
Friends
Teachers
Pets
Me