Yes. The Yona of the Dawn manga has ended. Although it might be sad for fans, it left a memorable impression with its engaging plot and characters throughout its run.
Definitely. Throughout the manga, it's clear that Yona's love for Hak grows and becomes an important aspect of the story. Their relationship develops in various ways that show her affection for him.
We don't know exactly when the Akatsuki no Yona manga will come to an end. It all depends on the story's complexity and the author's vision. Maybe there are still many exciting chapters to come before the conclusion.