Hm. I'm thinking of something from Classical Romance (Shoujo Manga Edition), in which Noburi would break things off with Yuno 'for real', but leave a note/message/letter to the only place she would visit and find (Perhaps nearby the river. Create a hole or some kind). In the letter, Noburi would explain his true feelings for Yuno, and revealed the reason behind him 'breaking things' off with her. At the end of the letter, Noburi would write 'Someday, I'll return to you.'
Either said promise is fake or not is up to us. We're Ninja, after all.
In this case, Yuno would either stay and waiting for something that may or may not come, or she would track us down, and follow us—like that scene from plenty Shoujo Manga.