Gary Shirley Girlfriend: 'Teen Mom' Star Cheated On Amber With 'Happily Married' Kristina Anderson [VIDEO]

10:14 AM EDT 10/22/2014 by Lindsay Cronin, Celebeat Reporter

Gary Shirley reportedly cheated on Teem Mom Amber Portwood with a "happily married" woman.

'Teen Mom' Amber Portwood Claimed Gary Shirley Cheated On Her While She Was In Prison

Earlier this month, Portwood revealed to press that her daughter's father cheated on her when she was behind bars. Prior to entering prison, Portwood claimed Shirley promised her a better life upon her release, but months later, he reportedly went public with Kristina Anderson.

“Kristina and her husband were very much together then,” an insider told Radar Online of Anderson and her husband, Gregory, who are parents to daughter Karly.

'Teen Mom' Star Gary Shirley Is Expecting His Second Child With Girlfriend Kristina

In court documents obtained by Radar, Gregory filed for divorce on Feb. 14, 2014, just under a year after Anderson and Shirley began dating. On April 16, 2014, the divorce was finalized.

“The Court now finds that the marriage of the parties is irretrievably broken and is hereby dissolved,” magistrate Stephen D. Chase wrote at the time.

Three months later, Gregory filed for a restraining order against Anderson. However, the former couple came to an agreement, and their hearing was later canceled.

Meanwhile, Anderson and Shirley have had some drama of their own. At the end of last year, Shirley accused Anderson of leading a double life, dragging him along, while carrying on a relationship with another man.

Portwood opened up about Shirley's alleged cheating in a Teen Mom special this month.

“When I was in prison, Gary was telling me that we were going to be back together, and he was looking for a house for us, and selling me this big dream,” Portwood said during MTV's Ask The Moms. “It was a couple of months before I got out that I found out that he was actually with somebody pretty much the whole time! So it was a huge shock.”

Gary Shirley is currently filming the fifth season of Teen Mom. The series is set to return to MTV next year.