Jon, however, knew why Steve had never felt love. It was because earlier in his life, he had an accident, which caused certain parts of his brain to no longer function. The doctors were amazed that he even survived the accident at all and said that he was fortunate that none of the vital parts of his brain were damaged.
It wasn't until later, though, that Steve realized that he was missing something. No, he didn't lose his memories, or lose the ability to move his body. He did, however, lose the ability to love. He no longer loved anything or anyone. He no longer loved his parents and eventually he found that he couldn't love girls either. He was still attracted to them though. He wasn't gay. But he just saw girls as objects to please him, nothing more.
He was just not physically able to love.