What Soda Curtis really wanted was that horse. He was really into horses and he had been working down at the stable and riding that horse every chance he got. But then it got sold and he was devastated.
The horse was described as a "buckskin horse" and it was kept at the stable where Soda worked. The horse was named Mickey Mouse and it really "belonged" to Soda more than to its owner.
Soda was really proud of the horse. He always talked about how he had an ornery horse -- he talked about it like it was his. But it was a pure quarter horse and worth a lot of money and, like I said, the owner sold it and it was taken away from that stable.
Aside from the horse, Sodapop Curtis was also very much in love with his girlfriend, Sandy. He often double-dated with his buddy, Steve Randle, and hoped to marry her some day. However, Sandy got pregnant and her parents sent her away to Florida, presumably to be farther from Soda. We find later in the story that it was not Soda who impregnated her: She had been cheating on him. Soda begged her to marry him anyway, but she turned him down. The final straw for Soda was when a letter he mailed to her was returned unopened.
In the book by Hinton Soda Pop has been helping pay the bills and make ends meet with Darry by working as a mechanic. He is in love with a girl named Sandy and he wants to marry her, but he knows that Darry still needs him and so does Pony Boy. He thinks that he will have to wait until Pony Boy is grown up. However, this is not what Soda Pop wants most of all. He wants his family to stay together. He demonstrates this by staying at the hospital all night when Pony Boy’s hospitalized.