Just a one time thing or lasts forever?

It all started on Saturday, September 11,2004. This was at our friend's, Marc, party. That's where Brittney and Tory hooked up at. :P And they have been dating since.   
Now this brings us to are question.
How long will they last?
 
 
Hint: if you pick lasts 4-ever then you are so cool.