Quote 7
"You're crazy!" he exploded. "I can't speak about what happened five years ago, because I didn't know Daisy then—and I'll be damned if I see how you got within a mile of her unless you brought the groceries to the back door. But all the rest of that's a God damned lie. Daisy loved me when she married me and she loves me now." (7.246)
Notice how Daisy's love is like a possession to Tom? He sees marriage as a system of ownership, and he's all about controlling access. Gatsby can bring groceries to the back door and drive her around, but he can't have anything more.
Quote 8
He nodded sagely. "And what's more, I love Daisy too. Once in a while I go off on a spree and make a fool of myself, but I always come back, and in my heart I love her all the time."
"You're revolting," said Daisy. She turned to me, and her voice, dropping an octave lower, filled the room with thrilling scorn: "Do you know why we left Chicago? I'm surprised that they didn't treat you to the story of that little spree." (7.251-252)
Tom expects a lot more from Daisy than he does from himself, but this was just par for the course in upper class marriages of the time (and a lot of time previously, too). Men got to play around; women got to produce heirs. It's a bargain.
Quote 9
"She's not leaving me!" Tom's words suddenly leaned down over Gatsby. "Certainly not for a common swindler who'd have to steal the ring he put on her finger."
"I won't stand this!" cried Daisy. "Oh, please let's get out." (7.275-281)
And one last proof that Tom sees marriage as an economic exchange: he's "bought" Daisy honestly, but Gatsby would have to buy her dishonestly. No word on what Daisy wants, of course.