50 Cent’s former friendship with boxer Floyd Mayweather, Jr. has spiraled down into an inevitable exchange of insults played out across Twitter.

The former partners and BFFs fell out when plans to set up a fight promotion company TMT fell through. As previously reported, the rapper, real name Curtis Jackson, is now in business with Mayweather’s boxing rival Manny Pacquaio.

Announcing he had severed all ties with Mayweather, Jr. last week, 50 claimed Mayweather failed to honor an agreement to fund the original joint venture.

In a series of Twitter posts, the G-Unit mogul wrote, “TMT Is Over. the money team is no longer a team… I’m no longer apart or down with TMT promotions… cause the other half of the money team Didnt put up there $Money$ (sic).”

After that post, things got ugly.

Mayweather tweeted in response: “Men lie… women lie numbers don’t lie. Wayne, Drake, Rick Ross, Kanye please help this boy.” The boxer linked the tweet to a chart featuring 50 Cent’s declining album sales in recent years.

Mayweather went on to call 50 “A male boxing groupie…,” adding, “hold my belts because your album sales have declined.”

50 Cent responded: “Money Floyd you know I have more Money then you (sic)… you go broke every fight stupid.”