Finally, but then what?

Since the beginning scene in Wharton's The House of Mirth, Lily Bart seems to have an attraction to Lawrence Selden that is simply an uncalculated feeling.  She first suppressed these feelings when she was interested with attaining a husband with a large amount of wealth, specifically Mr. Gryce.  He seemed to not have anything in common with Lily, and furthermore was disgusted by some activities she enjoyed, such as smoking and gambling.  But following Gryce's engagement and a chance meeting between them at the Bry's party, Selden found himself refreshed on her beauty and pertaining to their initial meeting "he felt an overmastering longing to be with her again," (Wharton, 110).  Seeing him take her silently to a private place and finally kiss her was extremely satisfying after such a build up.  Yet immediately after a confusing event occurs when Lily tells Selden to not tell her he loves her and rushes away.  This could possibly mean Lily doesn't share his affection, she's again interested in  satisfying her needs financially, or she doesn't want anything to happen at the party.  Lily, who has just achieved a rebirth into popularity in high society, may want to protect her new reputation, but Selden is generally viewed as a respectable man.  Presently it stands a mystery as to why Lily was so easy to give into her impulse, but so quick to rush away from him.  This is bound to develop into something much bigger than a simple brief romantic encounter.