Well... Some distance appears like a good strategy here.
15 e-mails unreturned says it all here by the sound of it..
You wouldn't wanna come off as a stalker now, would you...?
If there is a two-way-love thing happening here then she'll come back to you, bu tif not, and you really do love her, then you'll at least respect her decision to discontinue involvement with you and go off to find her happiness elsewhere... And accepting that would make you a pretty evolved individual in my book... Just gotta battle through the suckage of it all first though...
Good luck in any case.... 🙂