Without You, Homogenic. Not about the tittle, but the reff is nice for ur mood buster.

Happy without you

Are you happy without me
‘coz I’m happy without you
You don’t have to feel sorry
‘coz I’m happy without you
For all the things we’ve done 
For all the things we’ve runaway
You don’t have to feel sorry

I’m not sure if I’m still hoping
But one for sure there’s no sad feeling
Maybe I must admit that I’m happy being alone

Reff ;
Happy Monday.
Happy Tuesday. Happy Wednesday
Everyday is happy day, 
Everyday is something else to face