The Idris Ball

Clary just found out she is a shadowhunter. So the first thing she does is go to the Idris Ball. There she meets Jace Herondale. After the ball she can't get him off her mind, but its to late to do anything. A few days after she's back from Idris she runs into him on the streets of NY. What hapeens next? Do they become friends, enemies, boyfriend and girlfriend?