Stacey Esterly says that eight months ago, she began to grow concerned about her husband, Kevin’s, relationship with Amy Yu, their daughter’s 16-year-old best friend. Stacey says that Amy came into their lives eight years ago, and they considered her as a “fifth daughter”; she even went on family vacations with them.

TELL DR. PHIL YOUR STORY: Inappropriate Relationship?

Stacey says that after Amy and Kevin spent time together at the beach taking pictures during a recent family vacation, and after she saw a Facebook conversation between the two, she started to ask questions about their relationship.

“She had taken a selfie, and he responded -- I’m not going to say the exact words -- but that she looked very good. And she went on saying, ‘Please don’t shave until next time I see you,’ and he responded, ‘Hopefully, that won’t be too long.’ So the conversations were very inappropriate,” Stacey says of the communication between Amy and her husband. “I went to him, you know, asking what these were about, and that’s when we got into an altercation which led to the police coming to my house.”

WATCH: Woman Admits She Was ‘Jealous’ Of Husband’s Relationship With Their Daughter’s 16-Year-Old Friend

In the video above from Stacey’s exclusive interview with Dr. Phil, she shares what happened when she confronted her husband about the conversation.

In March 2018, Kevin and Amy ran off to Mexico. Police arrested Kevin at a resort and claimed he and Amy carried on a secretive relationship for months before running away together. Kevin is currently being held in jail on $500,000 bail, charged with interfering with the custody of a child.

On Thursday’s episode, Stacey accuses her husband of almost 14 years of more lies and betrayal, and tells Dr. Phil what she wants to say to him now. Check here to see where you can watch.

TELL DR. PHIL YOUR STORY: Are you involved in a story that has made the headlines?

'In My Heart, I Don't Want To Believe That They Were Sexual,' Says Woman Whose Husband Ran Away With Daughter’s 16-Year-Old Best Friend