Parts of that post didn't happen in any ep. The whole "Walt left Gretchen because her family was rich" or whatever was from an interview with Jessica Hecht, who plays Gretchen. It's never explained in "Peakaboo". Walt says "poor little rich girl, just adding to your millions"....but it's never stated that's why he left.
In "Peakaboo", Walt claims they stole his work.
Gretchen says he left her. "4th of July week end I go up to my room, you're packing your bags, barely talking". It's never explained why.
Anyway, Walt says "that's your excuse? To build your little empire on my work?"
The convo is basically over after that. So we don't know enough to know who's in the wrong.
Fred.