Here is a playlist of sad popular songs from the 2010s that would typically be played on the radio:

1. "Someone Like You" - Adele
2. "Stay" - Rihanna (feat. Mikky Ekko)
3. "The Night We Met" - Lord Huron
4. "Let Her Go" - Passenger
5. "All I Want" - Kodaline
6. "Back to December" - Taylor Swift
7. "When I Was Your Man" - Bruno Mars
8. "Skinny Love" - Bon Iver
9. "Say You Won't Let Go" - James Arthur
10. "Happier" - Ed Sheeran

Feel free to adjust the list based on your preferences!