Iggy Azalea -- My Ex's Divorce Talk Is Ridiculous ... He Just Wants Cash

Iggy Azalea is fighting back hard against her ex boyfriend -- saying she's not gonna let the 6-month fling take her for everything she's worth .. or even half.

We broke the story ... her ex-bf Hefe Wine is filing for divorce, claiming they've been common law married since 2008 -- which would entitle him to half the money she made over that time. But today in Nashville, Iggy said Hefe's got the facts all wrong about this so-called "marriage."

Iggy added ... she can see right through Hefe and knows his true intentions. Just watch her call him out for it in this clip.