Jack dies from smoke inhalation - This is Us
The really messed up part is we thought he was fine. Jack made it out of the fire and acts normal at the hospital, but he suddenly goes into cardiac arrest and leaves Rebecca mourning him.
Eve stabs Villanelle - Killing Eve
Right when we thought the two were having a moment, Eve stabs Villanelle and shatters our hearts. However, Eve regrets it immediately and starts panicking to try and save her.
Fitz sacrifices himself for Jemma - Agents of S.H.I.E.L.D.
There was only one mask to get them to the surface and despite Jemma's protests, Fitz insisted that she take it. But Jemma didn't give up on him, and she dragged Fitz to the surface with her despite how close to death he was.
Kat and Adena take a break - The Bold Type
We all saw this coming but it didn't make it any less painful. Adena wanted Kat to experience other relationships and Kat just wanted Adena. But Adena was starting to feel a bit trapped and her artwork was suffering from it. We still have our fingers crossed that they'll make it work in Season 3.
Alex and Maggie end their engagement - Supergirl
This was honestly the most heartwrenching breakup. Alex and Maggie love each other so much, but neither could budge on their opposing feelings about having kids.
Lindy leaves Tommy - Eye Candy
Lindy doesn't want to put anyone else at risk so she leaves to get to the bottom of her case alone. Tommy begs her to let him come, but she refuses.