You broke my heart

Whumpee is betrayed by someone close, someone dear, someone they used to trust... and it hurts. Emotionally, physically, through flashbacks, it doesn't matter. It hurts. It my or may not be related to "Betraying your organization".

Given the nature of this trope, there might be spoilers ahead.

Animes
Akatsuki no Yona


 * Ep 1: Yona finds her father dead by the hands of her childhood love, and has to face the ideia that she will be next. The man in question was also a very close friend of Hak, who deals with the treason with lots and lots of anger.

Kyou Kara Maou


 * Ep 35: Shibuya Yuuri has to fight Konrad (who he thought was dead) at a tournament, as he is representing the enemy side. Konrad don't exactly tries to hurt Yuuri with his sword, but the young king doesn't understand why his all time protector would ever betray him like this.

Magic Knight Rayearth


 * 2x09: Lantis feels betrayed when finds out that his friend is trying to invade his home planet, to make use of the ruler system that lead Lantis's brother to his death.

TV Shows
Gotham


 * 1x17: An old friend of Alfred Pennyworth (Sean Pertwee) knocks at the Wayne manor, and they let him stay for a couple days. But Alfred caughts him stealing and is stabbed.

Magnum P.I. (2018)


 * 1x15: It is revealed that Thomas Magnum (Jay Hernandez) and his friends were captured as war prisioners because Thomas's girlfriend sold them out.

Once Upon a Time


 * 2x21: Neal Cassidy (Michael Raymond-James) finds out that his fianceé has been lying and using him since the very first moment, as she had a secret agenda. He dares her to shot him, and she does.

Star Trek: Picard


 * 1x06: Soji (Isa Briones) follows Narek's instructions, which will supposidly help her answer some self questions, but that ends up serving to his own agenda. Being romantically involved so far, the betrayal has many implications.

The Flash


 * 1x15: Cisco Ramon (Carlos Valdes) figure it out that Dr.Wells has been lying about many things to all of them, and as his mentor confirms everything (and even admits truly liking him), he shows himself ready to kill Cisco.

The Haunting of Hill House


 * Ep 4: Luke Crain (Oliver Jackson-Cohen) gets out the rehab clinic of the time, 90 days clean, to go after his friend, who had run away during the night. She relapsed and he tries to help, even managing to get some money for a hotel, but she tricks him and runs away with everything. Nothing good happens to him after this.

Dramas
Kairos


 * Ep 2: Han Ae Ri (Lee Se Young) is tricked by a friend, and has all her savings stolen, all the money she saved for the last 5 years, to pay for her mother's heart surgery.