concentrate on studies, or any other reaons are just reasons to
be used for breaking up. perhaps to her, telling you otherwise
(other than she's with another guy) will make it more palatable for
you.
I have been through such cases before, the gal told me she broke
off because of religion (we're different religion) but in less than
half a year, she's getting married to another guy.
I am trying to highlight the fact that it doesn't matter what
reasons or excuse she used previously, the fact remained that both
of you are not together anymore. Hence, the main thing is to forget
her and move on.
I would suggest break off all contact, since both of you are not
together, you can lead individual seperate life. By not contacting,
you will not be reminded of her & things associated with her.
time will heal.