Hi dear,
Well first of be enough strong and bold. I know its quite difficult to forget somebody you loved so deeply. But dude let me tell you one thing. No matter how far you were if she really loved you she would have stayed with you and support you. By now with her attitude you have been able to see her truth. Be grateful you have not yet been married. Just think for a while, what would have been your case after marriage? Just take care of yourself right now. Focus on yourself and who knows the right girl might be waiting for you somewhere. Open the doors of your heart and your mind. Do things that keep you happy. If you are happy, your surroundings would be filled with happiness. Happiness will follow your path. Please keep smiling! 🙂