Everything that could have happened with a non-zero chance happened, infinitely.

So there’s an infinite number of Jason2 worlds with a Jason1 who somehow blended in and goes on.

And where Jason1 stayed with Amanda.

And where Jason2 blended in with Jason1s family and kept the cement in place.

And an infinite number of dead Jasons, Blaires, Amandas, Leightons, and those other two scattered throughout the multiverse.

Everyone gets an infinite number of happy and tragic and mediocre endings. Any and all ships, fan fiction, and hypothetical scenarios, with the slight limitation of “has to be a possible universe that the characters could have existed in”, are canon.