Floyd Mayweather Sues Ex Girlfriend Shantel Jackson for Stealing his cash and used his credit cards for personal shopping spree (Details, pics)

Floyd Mayweather's ex-girlfriend, Shantel Jackson, used his credit cards on the sly and helped herself to his piles of cash.... according to the lawsuit he just filed against her.

According to documents, obtained by TMZ Sports, Shantel got access to Floyd's credit card accounts, and scooped cash around his house, to go on personal shopping sprees. He claims she shipped all her illicit booty to a secret location to keep him in the dark.

Floyd claims Shantel would praise him in public when he got bad press purely to gain his confidence. In the documents his lawyer writes...

"As a result of that confidence, Mayweather, who's education ended at eighth grade, did not audit or otherwise inspect either his cash or his credit card statements for theft by Jackson."

Translation: She pulled a rope-a-dope, and yeah ... Floyd was the dope.   

The boxing champ's suing his ex for theft -- no specific amount. Shantel is still suing him, too ... for a slew of reasons, including domestic abuse and invasion of privacy.