Your spouse/significant other has just died and your grief has so moved the god of plot contrivance that they offer you a boon:

They can’t bring back your loved one but what they can do is pull a version of the same person from somewhere in the multiverse as a replacement. They will be mostly the same as the one that just died, some differences would likely be inevitable, but the one guarantee that the god gives you is that they come from a timeline where you recently died and they are open to dating/loving you. Do you accept?

Note; if you are poly, then all your polycule has died but compatible versions of those same people would step in.