FLAGSTAFF, ARIZONA: As 'Sister Wives' Season 18 is on the verge of release, there is only one wife remaining in the marriage. But is Robyn and Kody Brown's marriage also in jeopardy?

Robyn confessed that there has been a time when she went through "hell" with her husband, but is now navigating a new role in her marriage now.

Robyn says that she has been labeled as the "wife left standing." As she threw more light on this, Robyn opened up about her current marriage status with Kody.

Are 'Sister Wives' Season 18 couple Robyn and Kody Brown divorcing?

People reports that Robyn is now navigating a monogamous life with her husband Kody. But, are there ups and down going on in their marriage that could eventually lead to divorce?

Robyn is dealing with the changes in life but never envisioned her marriage to be polyamorous. But, after three other ex-wives -- Christine, Janelle, and Meri Brown, leaving Kody, Robyn has been left with no choice.

Processing her marriage, she said to the outlet, "No one should be married while they’re going through a divorce."

Does this mean she is also thinking about leaving Kody just like the other sister wives? The reality star says, "I feel like we failed."

Robyn Brown confesses going through 'hell' as Kody Brown sabotaged 'Sister Wives' star

TLC star Robyn claims about her relationship with Kody, "It’s been hell. There have been times he’s tried to self-sabotage and sabotage us. I’ve had to work hard not to let him."

On being disheartened by the break in the polygamous marriage, Robyn says, "The commitment we made, we were all in this together, We screwed it up."

To make her marriage work out, Robyn is now seeing a therapist.

The star confessed to never wanting to leave Kody, saying, "I never thought I wanted to leave. I know how much I love Kody. He's doing his best."

Who is 'Sister Wives' star Robyn Brown?

Robyn Brown was born on October 9, 1978. She was previously married to David Jessop. She had three kids with David - Dayton, Aurora, and Breanna Rose.

Later, Robyn met Kody in 2009 and got spiritually married in 2010. She was Kody's fourth wife but now has become the only wife.

Robyn and Kody legally married in 2014.

Who is 'Sister Wives' patriarch Kody Brown?

Kody Brown is the 54-year-old TLC's 'Sister Wives' patriarch. He was born into a polygamist family and followed the same lifestyle in his life.

He first met Meri Brown and got married in 1990. He then spiritually married Janelle in 1993 and Christine in 1994.

Later, Kody divorced Meri in 2014 in order to legally marry his fourth wife Robyn. But, as of now, none of his wives except Robyn is involved with him in the polyamorous marriage.

'Sister Wives' Season 18 will release on August 20 at 10 pm ET on TLC.