Laveranues Coles' ex-fiancee is BLASTING the former NFL star -- claiming he's an "a**hole" who's lying about their engagement to make HER look like the bad guy in their war over a $240k engagement ring.
TMZ Sports spoke with Kenda Fairchild ... who says Coles originally popped the question back in 2008 ... 5 YEARS after they first started dating.
Fairchild says she's pissed because she believes Coles is trying to convince the court they were only together for a couple of months before she broke it off ... and it makes her look like she was just in it for a payday.
"It's such a lie," Fairchild says ... "He's being such an a**hole right now."
"We've been engaged since 2008. We've been together since 2003. I dealt with enough of his bulls**t and that's why I left him. I got tired of it."
When asked why she doesn't just give the ring back and move on, Fairchild explained ... "After 10 years? Hell no."