Jenelle Evans Accused Of Using Drugs By Ex Nathan – His Shocking Claims EXPOSED!

Nathan Griffith can't resist taking low blows at his ex-fiancé! In a Teen Mom 2 reunion sneak peek, Jenelle Evans' ex accused her of being a drug addict during a fight over custody of their son.

The clip kicked off with Griffith explaining how he has been unable to see their son Kaiser, 1, because she accuses him of having no supplies.

"If I give you pictures it still won't be good enough so how about I meet up with David Eason and I'll buy stuff in front of you," Griffith said of his past conversation with Evans. "I will do anything you want."

Evans, 24, replied, "He has no highchair, he has no sippy cups, he has no food for him, he does not have anything. He has a one-bedroom apartment. He doesn't even have a room for Kaiser."

Griffith responded by blasting Evans!

"It is funny that my son is in an unstable environment with two drug addicts," he said. "You see weed in the background... smoking constantly. And now you have all these mystery 'illnesses' with all of these drug abuse problems."

Evans changed the subject by asking why Griffith's lawyer wrote their sex was painful in a complaint.

When Griffith said how she shouldn't be talking about their sex life on television, Evans replied, "I'm sorry if it bothers you that I talk about my sex life, sorry I'm not with you anymore."

Griffith then jabbed, "I don't want you to be with me! How many pounds have you gained? 30, 40 pounds?"

Evans responded to her ex's diss over Twitter by posting, "Like I said… Yeah I've gained weight but that's because I'm happy and healthy in life… is he? Probably not."

When the mother-of-two took the dis a step further by making fun of his man bun with a meme, he tweeted, "Awww thanks for noticing me (Again. And again. And again. And again)! Jokes on you and always will be!"

The Teen Mom 2 reunion airs Monday at 9/8c on MTV.