'Teen Mom 2' Jenelle Evans Fiance Nathan Griffith Confesses to Cheating on MTV Star! Will Reality Couple Survive Arrest and Bloody Blowup?

Teen Mom 2 star Jenelle Evans has even more issues on her hand after her fiance Nathan Griffith's arrest for domestic violence. Now reports have surfaced that the MTV dad has been cheating and wants to leave the reality star for another woman! Shockingly, Nathan spilled all to his cell mate Jason Sasbon after being sent to jail over his nasty fight with Jenelle. According to the jailbird, the reality dad had been seeing "an old friend" who he appeared "madly in love" with, which triggered the blowup between the reality couple.

"He's been meeting up with her halfway in North Carolina, staying in a hotel," he told Radar Online. "They went out drinking and had drunk sex. It started with a massage and then he hit it up."

"He was really freaking out about this girl being upset with him still being with Jenelle," he continued. "He's probably in Virginia with her. That's where he was going when he got out of jail."

Sasbon even clarified what happened during the fight that landed the father of two in jail. Nathan wanted Jenelle's engagement ring back and tried to forcibly take it from her.

"She was fighting to keep it on and he was grabbing her wrist and pulling it off. He paid a lot of money for the ring and he wanted the ring back," he told Radar.

Little Kaiser's dad even detailed the violent relationship he has with the MTV mom, which includes physical abuse.

"[Nathan was] talking about how Jenelle's the aggressor and she's violent," according to the gossip site. "She bit him on his back. He showed me the teeth marks on his back. He showed me some pretty vicious scars from bite marks, big, giant, open mouth bite marks."

But Jenelle denied that accusation when asked about the Radar report on Twitter, writing, "@_Tressa_ uhm... Actually @Vkillem7 bit his back... So this dude is a liar. Lmao."

@_Tressa_ uhm... Actually @Vkillem7 bit his back... So this dude is a liar. Lmao

— Jenelle Evans (@PBandJenelley_1) March 9, 2015

As MStars News reported, the MTV star is surprisingly now defending her fiance and blaming police for the arrest aftermath. "Funny thing is I never said he hurt me, never said he hit me. The police took over, I never called. Mind ur own business," Jenelle tweeted.

@Katiebyeager funny thing is I never said he hurt me, never said he hit me. The police took over, I never called. Mind ur own business. — Jenelle Evans (@PBandJenelley_1) March 6, 2015

Do you believe Nathan's cellmate about the reality couple's volatile relationship? Comment below!

So "Teen Mom 2" star's fiancé was arrested yesterday...I took this pic while my daughter was out riding her bike. They're my neighbors but probably not for long. #teenmom2 #drama #staged A photo posted by James Hopkins (@james30173) on Mar 5, 2015 at 8:39am PST