Saw a couple of Pokemon episodes today, and saw an episode where Mandibuzz moves Scrafty out of its own territory; Meowth helped Ash and the rest get Scraftys' territory back, but he said he wasn't part of Team Rocket anymore. Has Meowth been seen with Team Rocket after this episode? That's so sad..
Meowth traveled with the group for a few episodes, starting from Meowth's Scrafty Tactics! (the episode you mentioned) but he rejoined Team Rocket as of Crisis From the Underground Up! (which is the first of the two Battle Subway episodes that ends the 14th dub season).
So, to answer, Meowth is technically back with Team Rocket.
Incorrect. Meowth is still part of Team Rocket now. But during this time in the series Meowth indeed pretended to get fired from Team Rocket and traveled with Ash and co for a little while. It was all planned from the beginning. This happens at least once per saga. Meowth "quitting" Team Rocket.