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I hear a lot of ambivalence in your post too. You said you "made my decision to leave him once and for all" yet you turned around and flooded him with text messages begging him to come back. Which way do you want it?
Your ex is right about one thing: you need to concentrate on your studies. Leave him alone and work on turning yourself into a strong, independent woman capable of supporting yourself both financially and emotionally. You sound like you honestly don't know what you want in a man right now. You'll be doing yourself a huge favor if you wait until you DO know what you want before getting into another relationship. And forget about begging and pleading and thinking he's going to come crawling back to you. He has already moved on with this other girl, and you are now part of his past.
I guess I should have written the sentences in the right order!
Thanks for your advice anyway. =)