Whatever you do, don't sink yourself so emotionally into every girl that comes your way, Myself and a lot of people around me have caused themselves so much pain, because we jump into relationships and let ourselves become obsessed with someone.
That is why it hurts so much for you. You thought you had found the love of your life, but trust me when I say, your first is never your only. There will be others, you need to get out there and find them.