Heart Guardians Part 20 - Panels 139-164 (Patreon)

Originally Dave was simply not going to believe Tabitha about reality being changed, but after writing their dialogue, there were enough inconsistencies from the change that it made more sense for Dave to believe Tabby.

That said, given how in real life people in the live in different realities these days, I probably could have found a way to write this where no matter the evidence Tabby presents to Dave, Dave finds a way to rationalize it (or gets angry and refuses to discuss it further).