Monster Mom Hits Rock Bottom? Jeremy Calvert Begs Troubled Ex Leah Messer: 'Get Help!'

(As RadarOnline.com exclusively reported, the pair initially split in November and reconciled in January, only to break up for good in April. Their divorce was finalized in June.)

After the traveling pipeline engineer, 27, places Addy into his car, the broken couple attempts to talk.

"After I had Addy, carried our child, I've had a lot of issues," Messer admits. "A lot of stuff I can't fix, I wish I could get up and just go. I wish I could feel better."

(Messer began using painkillers after a difficult delivery with Adalynn in 2013, sources say, which soon turned into prescription pill abuse.)

"You stay up, I get text messages on my phone when you're up at 4 o'clock in the morning on a school night," a frustrated Calvert yells.

"I have an issue with that!" she snaps, her eyes wild.

The Teen Mom 2 dad then calms down and tries to reason with her.

"You were a great person in the beginning and then all of a sudden you just started dwindling away…That's when you get help!"

Eventually the two part, and Messer drives home alone, sobbing and muttering to herself.

"He doesn't know. He was never there!" she cries, pulling out a menthol cigarette.

As RadarOnline.com readers know, Messer checked into a rehab center across the country from her West Virginia hometown in May.

After completing treatment, she moved in with new boyfriend T.R. Dues, 32, and still has custody of her youngest daughter and 5-year-old twins Ali and Aleeah.