What ever you do, you're just going to have to accept your gonna feel like **** for about another 2 weeks/month. However, getting back into contact with him will just make things even messier and drag out your pain because it doesn’t work in situations like yours. It's hard to take advice from people who aren’t in your situation; I often find it irritating myself, but its often the most sensible advice. That is damn bad what he did to you. On the positive side, you’re in the lowest of troughs at the moment, so things can only get vastly, vastly better. It's an awesome career you've got lined up, one so many try and fail to make it into. No matter how much you don’t think you'll get over him, millions and millions of people have managed it in the past. Its just one of those really crap experiences that is almost inevitable in modern life, and its also an opportunity to strengthen yourself, as no matter how cheesy it sounds, you will be stronger and more experienced because of this very unfortunate incident. As others have said, count yourself lucky you didn’t marry him.
Getting rid of everything that reminds you of him, especially things that provoke fond memories etc. That’s probably the best starting point. Going to the gym or running, or doing other things you enjoy to fill up your day will be the best way to get over him in my opinion. Going out with your mates is always a bonus too, providing you’ve got decent, unbitchy mates.