Verified answer

i cant remember what site it was but on some site i read a leaked script from episode 7 "War at the Roses"

and it pretty much ends with them having hate sex on the dinning room table

and in epsidoe 6 im pretty sure they have a true and then in episode 7 serena and nate make them make it a legal document so they say like that

but then dan wants them to hate each other so jenny can come back so he sends stuff to gossip girl like blair having lunch with jack and stuff but they know that its not true

and then in the end of the episode chuck rips up the truce and they both say they hate each other and have sex so i think after a while they will fall back in love:)

Spoilers: http://www.spoilersguide.com/gossip-girl/

There is a really good chance, but it might not be "pretty"/all lovey-dovey. That's what one spoiler said, and it was from a credible site