Preboot!Clark had an established relationship with his preboot!Bruce. Nu!Bruce and nu!Clark do not. Preboot!Clark comes to the New 52 verse and is the catalyst that gets them together. Nu!Clark gets jealous because, after all this time, Bruce has never shown interest towards him, but now is attracted to his doppelganger/AU self?

Bonus points for angst on reboot!Clark's part (that's not his Bruce)