User blog comment:JoshofBlades/Tiber's Hard Work Shall NOT Be Torn Asunder!/@comment-124.187.0.229-20111220045714/@comment-173.184.68.192-20111221054430

It states in The Great War that turning Hammerfell against the Empire was one of the Thalmor's long term goals. An Empire without friends has no power. Titus didn't happily betray Hammerfell. He inherited a weak empire I'm sure he didn't want to weaken it further. Titus ended the fighting so the Empire could fight another day.