Jenelle's Ex Curses Her Out In Blistering Voice Message

It's been months since Jenelle Evans and her baby daddy and ex-fiancé Nathan Griffith called it quits, but the time apart hasn't mellowed their rocky relationship.

RadarOnline.com has obtained an explosive voicemail from Griffith to Evans that shows just how bitter their breakup REALLY was.

"Since you won't talk to me and you're WRONG, I'm gonna leave you a voice message," an angry Griffith sneers in the clip, before launching into a blistering rant.

What's the back story to his tirade?

According to a source close to the former couple, when they split, "Nathan wanted both him and Jenelle to remain single."

But Griffith didn't hold true to his word.

"He was still seeing Jessica, but at the same time he was calling Jenelle arguing and telling her that he wasn't dating Jessica — that they were just friends," the source claimed.

As RadarOnline.com first reported, Evans has also been dating a new man named David Eason since she split with Griffith.

And when the news broke about her new relationship, Griffith got upset about it and started to leave Evans a series of nasty voice messages.

In the one obtained by RadarOnline.com from Sept. 24, Griffith calls Evans out as liar.

"Nathan called Jenelle to try and tell her that she lied about 'staying single,'" the source said. "But Jenelle had already told him, 'What does it matter?' and that she had already moved on."