This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / The Crying Game
After Dil kills Jude, she motions to kill Fergus, but can't, tearfully saying, "I can't. He [Jody, her dead boyfriend] won't let me." Dil begins to put the gun in her own mouthto kill herself, but Fergus tenderly removes the gun, and tells her to leave. He'll take the rap for killing Jude.