Im depressed and dont know how to move on

Hi im chris and im just really depressed bc last year I met this girl on kik (a social media app) on september 1st of last year and we started talking on discord. we soon developed feelings for each other and we used to talk all day every day. we planned on meeting up in the summer where she lived in idaho and go out to dinner together. a bit later her feelings for me faded away and she decided to just stay friends, we still planned on meeting up and going out to dinner together but as friends. She ended up leaving me on december 1st 2020 (by that i mean stop talking to me) and after that ive been extremely sad bc i loved her so much and we had such a close relationship. Awhile later in febuary she came back and messaged me on discord, i was so happy she was back. she said she was sorry for leaving me and said she came back to check up on me and see how i was doing. 3 days later though she did the exact same thing and left. So im back to being depressed and dont know how to move on from her.