If only I hadn’t done that last run, I wouldn’t have gotten injured.
If only I hadn’t had that last drink, I wouldn’t have made a fool of myself.
If only I hadn’t said that last thing, we would still be friends.
The running injury results from months on poor form. The foolish behaviour at the bar was as much a result of the 10 beers that proceeded it as the eleventh. A friend will forgive a slip-up, but perhaps not years of insensitivity.
It’s rarely the last thing.