I know it might feel like you've lost everything, but you haven't. Everybody has to say goodbye at one point or another and in one way or another. It's part of life. How do you deal with it? That depends on the person. You might cry, you might pray, you might find a person you trust and talk to them about it. And mostly you just keep on putting one foot in front of another and carrying on with your life. Believe it or not it really does get easier with time. And, if this is a breakup type situation (hard to tell from your post) DO NOT STALK HER. Seriously. It's not cute and it's not loving and it probably will not help you get her back.