I looked through the info from the ex gf and I don't see anything about him 'throwing her across a room.'
The woman said she offered to drop the papers off the following day, but Zimmerman became upset, took her cellphone and shoved her. A fight ensued, she said, and her dog bit Zimmerman's cheek.
The ex-fiancée reported that Zimmerman had "open handed smacked" her in the mouth and berated her during an argument in January 2003.
In November 2002, Zimmerman claimed his ex had assaulted him with a baseball bat after he went to a concert without her.
http://articles.orlandosentinel.com...ce-20120321_1_petitions-documents-injunctions
It sounds like a troubled relationship on both sides, imo. But a shove and an open handed smack don't sound all that violent in comparison to what we are hearing about him.
As for the other 'story' about his being fired for assaulting a woman. I am not sure how accurate that is. Nobody else has come forward, including the woman. And why wouldn't she sue if he threw her across a room while he was on duty as a security guard? Why wasn't he arrested?