What quotes (chapter and page) says that Myrtle regrets marrying George Wilson?
About half-way through chapter 2 of The Great Gatsby, Catherine and Myrtle have a conversation about George:
"Well, I married him,." said Myrtle, ambiguously.
"And that's the difference between your case and mine.." "Why did you, Myrtle?." demanded Catherine.
"Nobody forced you to.." Myrtle considered.
"I married him because I thought he was a gentleman,." she said finally.
"I thought he knew something about breeding, but he wasn't fit to lick my shoe.." "You were crazy about him for a while,." said Catherine.
"Crazy about him!." cried Myrtle incredulously.
"Who said I was crazy about him? I never was any more crazy about him than I was about that man there.." She pointed suddenly at me, and every one looked at me accusingly. I tried to show by my expression that I had played no part in her past.
"The only crazy I was was when I married him.
Myrtle's affair with Tom has spoiled her. It's afforded her a New York apartment, mint julips, and a fancy collar for her dog. Myrtle thinks she's has gone from the bottom of the social ladder to the top.
Myrtle has also bought into Tom's racist and class-warrior ideas. As such, she views George as a poorly bred mongrel. She has bought into Tom's social-Darwinian view that whites are better than blacks, white collar is better than blue collar, East Eggers are better than West Eggers, and that a Valley of Ashes mistresses can become a posh New York socialite.
This is all before Tom slaps some sense into her.