@Hjarloprillar,
Someone who had once been close to me died recently. That made me focus on the relationship we had and where it fell apart. It crossed my mind to go back to the evening that happened and to speak up.
That reminded me of an old Child Ballad (243) called James Harris or the Daemon Lover or the House Carpenter. The plot involves an old boyfriend returning to claim his now married former sweetheart.
Often, the lover is revealed to be the devil. I imagine that the ballad was composed by some 16th C version of Stephen King or Edgar Allan Poe . . . but . . who is the Daemon Lover. One of the things he might be is a time traveler. He could also be the manifestation of her imagination or of a fever, particularly childbirth fever as she leaves her babes.
Maybe all those who loved and have regrets about the outcome are, in some way, time travelers.
For a short time, I thought I would be willing to fall into a black hole to correct the past, but I have adult children and grandchildren. My need to correct, to follow a different fork in the road, would leave holes in the present.