It's ironic for me to be saying because im going through a smiliar situation but one thing to keep in mind is that people come and go everything is temporary it's harsh but it's reality you seam like a good person as of now I don't know what to tell you other than to take this as a good opportunity to learn and better yourself and to make new friends hope this helped in anyway <3

Im going through a similar thing with my friend so i dont really have and place to give advice but, i would say to just focus on other friendships and get closer with other people. Im here if you need to talk ❤️