“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.

He knows “you’re with me / In a way that won’t show / And you’re with me wherever I go / But you give me this feeling, this everglow.” Through this feeling, he feels that this person is still with him, and he derives comfort from this feeling. Despite them being physically distant, there’s still a connection, even if it is only one way now.

Oh they say people come
They say people go
This particular diamond was extra special
And though you might be gone
And the world may not know
Still I see you celestial

Like a lion you ran
A Goddess you rolled
Like an eagle you circled
In perfect purple
So how come things move on
How come cars don't slow
When it feels like the end of my world?
When I should but I can't let you go?

But when I'm cold, cold
When I'm cold, cold
There's a light that you give me
When I'm in shadow
There's a feeling you give me, an everglow

Like brothers in blood
Sisters who ride
Yeah, We swore on that night
We'd be friends 'til we died
But the changing of winds
And the way waters flow
Life as short as the falling of snow
And now I'm gonna miss you, I know

But when I'm cold, cold
In water rolled, salt
I know you're always with me
And the way you will show
Cuse you're with me wherever I go
And you give me this feeling, this everglow

What I wouldn't give for just a moment to hold
Yeah, I live for this feeling, this everglow
So if you love someone, you should let them know
Oh, the light that you left me will everglow