Ok man I feel your heartbreak, been there before with you, knows how it can seem like the end of the world, but like TK said life is a looooooooooooooooooonnnng time and it goes on.
I want you to take it slow and don';t jump into anything new so soon. I know this is going to sound kind of mushy but you gotta give your yourself and your heart time to heal so you can really move on.
trust me if she gets with someone else after such a short time, then she really didn't have your best interest at heart. Her lose bro