Sorry for the Repetition

When Tony fails to save Clint from a mission gone bad, there's only one thing to do. Reset the clock and try again. So he builds a machine that allows him to go back in time in an attempt to change fate...but he fails again and again and suddenly he's not confident anymore. He's terrified that he'll never be able to save his lover. For this prompt.

This fic is fairly dark. There's no onscreen violence, but there is discussion and description of the trauma and injuries Clint suffers, and how he dies, as well as discussion of grief and survivor guilt/trauma.Also for my longfic bingo square: Someone Died/Didn't Die.