Teairra Mari's Ex Swears He Didn't Leak Sex Tape, Plans To Countersue

Teairra Mari's ex-boyfriend, Akbar Abdul-Ahad, says she's pointing her finger at the wrong guy when it comes to who leaked her sex tape ... because it's not a guy at all ... it's a woman.

Akbar is being accused of hacking into Teairra's Instagram account and posting the XXX video, from which 50 Cent then grabbed a screenshot and shared with his 18 million followers. Teairra's lawyered up and is suing, claiming it's revenge porn.

But, when we spoke with Akbar he claimed he knows the culprit, a female, but wasn't naming names. He says Teairra's putting on an act because that's what she does by trade, plus he claims they were hanging out as early as last week, days before her lawsuit was filed.