Actually the full copy/paste that Kanaizja is referring to is:

SONG MEANING: "Everglow" by Coldplay is about the feeling of warmth or happiness that comes with the sadness you feel when you think about a relationship, situation, or friendship that has now ended.

It can be found here:

https://www.popsongprofessor.com/blog/2015/11/28/what-does-everglow-by-coldplay-mean