Episode 11 of "Married at First Sight" season 4 will follow the three couples as they reevaluate their relationships and test how much they trust each other.

Titled "To Love and to Cherish," the episode will also see Heather regret her decision to divorce Derek just shortly after they got together.

In the official preview for the episode, all the three couples are shown experiencing some troubles in their relationships, especially when it comes to communication. This is most apparent between Tom and Lillian, whose trouble stems from Lillian's excessive phone use. The trailer shows Tom directly telling the audience that he has been having trouble communicating with Lillian because she is always on her phone, to the point that it is already annoying.

While Tom and Lillian apparently have some trouble to fix, they are likely the only pair to last as the two others are already showing signs of going their separate ways soon. Nick and Sonia might part ways before the show is even over.

A few days after the series debuted, Heather and Derek already got divorced. However, the trailer shows that Heather might be regretting the decision, as she states that Derek is not really a bad guy and that she might have just misjudged him too soon. On the other hand, Nick and Sonia have been living apart and may find it hard to get back as a couple.

"Married at First Sight" season 4, epsidoe 11 airs on October 4, 8:30 P.M. on FYI.