Some might say that Rufus and Lily mirror Dan and Serena's relationship, when they really mirror Dan and Blair's relationship.
At first, Lily was with Bart, they were even married. However, Rufus didn't do anything about it, he just kept silent and waited for Lily. Then they had their time.
Rufus got famous in his time because of the songs he wrote for Lily. Dan got famous because of his novel, Inside, that was somehow for Blair.
Dan: Ты ever hung out with someone, but not be able to tell anyone?
Rufus: Ты mean uh, “hang out, hang out” или Ты know “hang...