He was thinking about someone special. He was thinking about her, but she didn't know. His feelings were obscure, but his goal was clear. He misses her. The happiness that is brought to him by her mere presence was shocking. He cherishes those moments, for whatever hardships may face him in the future, he can look back on those moments with a smile and maybe things won't be so hard anymore. He would much rather face them with her by his side because her presence brings so much more happiness than a memory.