None of them really did?
Gisele was already an established name and then married NFL royalty after getting out of the Leo train.
Bar Refaeli sort of went into obscurity after he dumped her.
Erin Heatherton left the modeling business disillusioned with it not too long after their break-up.
Blake Lively quickly moved on with Ryan Reynolds.
I don't think he dated Kelly Rohrback long enough to make any sort of impact. I'm guessing few people even know they dated!
Nina too didn't really get a huge career boost from her relationship, like many other girls on his list of conquests, she was probably already past her career peak when they broke up.
As for Cami, she might have benefited from his aura, but she didn't need his Hollywood connections since her step dad is Al Pacino.