Chapter 6 : At the hospital Ponyboy realizes that Darry really cares for him. Why has Darry been so hard on Punyboy in the past?

Ponyboy realized how much Darry loved him when he saw him crying. It was then he realized that Darry was hard on him because he wanted him to be the best he could be.....

I let go of Soda and stood there for a minute. Darry didn't like me... he had driven me away that night... he had hit me... Darry hollered at me all the time... he didn't give a hang about me.... Suddenly I realized, horrified, that Darry was crying. He didn't make a sound, but tears were running down his cheeks. I hadn't seen him cry in years, not even when Mom and Dad had been killed. (I remembered the funeral. I had sobbed in spite of myself; Soda had broken down and bawled like a baby; but Darry had only stood there, his fists in his pockets and that look on his face, the same helpless, pleading look that he was wearing now.)
In that second what Soda and Dally and Two-Bit had been trying to tell me came through. Darry did care about me, maybe as much as he cared about Soda, and because he cared he was trying too hard to make something of me. When he yelled "Pony, where have you been all this time?" he meant "Pony, you've scared me to death. Please be careful, because I couldn't stand it if anything happened to you."