Most Helpful Guy
With the fact that he broke up with you I'm leaning toward the likelihood that his feels for you had been declining for a while, but it's possible that he moved on and still may have had feeling for you the day it ended. Some people move on faster than other. For me after a relationship ends that it. I don't look back of dwell on what was.
Most Helpful Girl
It probably happened over time.
Stop trying to force a friendship he obviously doesn't want.