This happened virtually every other episode, especially towards the end of the series when everything bad that could possibly happen just kept on happening in relentless succession. Here's a photo essay about all of the saddest scenes. Fair warning, this contains lots of spoilers, sobs, and Avon. Because of course it does.
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1. Favourite episode
2. What you wish happened
3. An unpopular/cracky opinion you hold
4. Your song/fan mix for the show
5. Most Romantic moment?
6. Favourite photo/screenshot
7. Favourite non-romantic OTP
8. Crackiest moment?
9. How would you convert someone to your show?
10. What show related fan works you would like to see?
11. Worst decision
12. Scene that made your heartbreak?
13. Best use of a hoary old trope
14. Most woeful use of SFX
15. Best scene involving eating/drinking
16. Something that made you Think
17. Something that made you Laugh
18. Best series opener
19. Best season finale
20. Which character would you like to go to lunch with?
21. Crime against fashion
22. Favourite quote(s)
23. Favourite costume/clothing/accessory
24. Favourite character moment
25. Biggest BAMF
26. Something from your head fanon
27. Least Favourite episode
28. Which character would you be?
29. All the pairings you ship
30. The coolest thing
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9. How would you convert someone to your show?
10. What show related fan works you would like to see?
11. Worst decision
13. Best use of a hoary old trope
14. Most woeful use of SFX
15. Best scene involving eating/drinking
16. Something that made you Think
17. Something that made you Laugh
18. Best series opener
19. Best season finale
20. Which character would you like to go to lunch with?
21. Crime against fashion
22. Favourite quote(s)
23. Favourite costume/clothing/accessory
24. Favourite character moment
25. Biggest BAMF
26. Something from your head fanon
27. Least Favourite episode
28. Which character would you be?
29. All the pairings you ship
30. The coolest thing