‘Married at First Sight’ Season 4 episode 7 spoilers: What happens when Lillian finds out Tom’s secret? Derek breaks down, Heather distances herself

"Married at First Sight" (MAFS) Season 4 episode 7 debuts on Aug. 30. The drama escalates as the honeymoons comes to an end and the three couples--Sonia Granados and Nick Pendergrast, Heather Seidel and Derek Schwartz, and Lillian Vilchez and Tom Wilson-face the realities of life. The seventh episode is titled "For Richer or Poorer" and it will see what happens when the couples return from their honeymoons. Here are the detailed spoilers for the next segment of the series. Read on to find out what happens next.

[Spoiler alert! This article contains spoilers for "Married at First Sight" (MAFS) Season 4 episode 7 "For Richer or Poorer." Do not read further if you don't wish to know more about it.]

In the last episode, the couples went on their honeymoon and got to know each other better. However, Tom continues to keep the secret and Heather and Derek deal with their issues.

Moving on to "Married at First Sight" (MAFS) Season 4 episode 7. According to TV Guide's description, "For Richer or Poorer" will see the couples move in together as they return from their honeymoons. This is the actual beginning of their domestic life.

At this point, Lilian finds out the truth about Tom's living arrangements. She finally learns that her husband lives in a bus and does not have a proper house. This is expected to be a turning point in the couple's life. Lillian definitely did not dream of a life like this. Will she be able to accept Tom's lifestyle or will force Lillian to ask for divorce already?

Meanwhile, Sonia finds out that Nick has two dogs and she is not very thrilled about it. In fact, she is afraid of dogs and she is forced to deal with the problem. Sonia tries to overcome her fear but will she succeed or not remains to be seen.

As for Derek and Heather, their marriage continues to fall apart. In an attempt to work things out together and save their marriage, they decide to visit a pastor.

An exclusive promo video for "Married at First Sight" (MAFS) Season 4 on Us Weekly teases what happens the last night of Derek and Heather's honeymoon. While Heather is happy to get back home, Derek breaks down.

"The honeymoon is over," Derek tells the camera in the promo. "The honeymoon's been over, but now it's technically over. ... Now she's not talking to me at all - she's not making any eye contact with me. She's really distant."

"As far as Heather and I go, I don't know," he continues. "I am disappointed and hurt - I feel like I did this with an open mind, and out of all the possibilities, I never would have imagined that I would be matched with somebody who would want to walk away from this after two or three days."

Meanwhile, it seems Heather has really given up on her marriage. "I want to be married because I want to share my life with someone, but this isn't the type of marriage I wanted to have," Heather said.

"Married at First Sight" Season 4 episode 7 airs Aug. 30 on FYI at 8.30 pm. Stay tuned for more spoilers and updates.