Hope Shingo can get over keiichi and falls in love again with someone who truly care about him and not just want to own him. Keiichi walked in to this relationship knowing that Shingo has all these trust issues, made a promise. Time passed, he makes a fuss about it, and walked away. Why start it in the first place. Half heart guy like him doesn't suite Shingo's personality at all.
http://www.yaoiotaku.com/forums/threads/49526-G-Defend-by-Morimoto-Shuu-JP