She has suspected that something has been going on for a while, and now, Katie (Heather Tom) has received confirmation that she was betrayed by her husband and her sister on The Bold and the Beautiful.

After overhearing Bill (Don Diamont) on the phone with Brooke (Katherine Kelly Lang), Katie slipped a drink and then went to Liam (Scott Clifton) to calm down. And though he knew the truth about Brooke and Bill's affair, he didn't say a word to her because he knew it wasn't his confession to make. He got Brooke to come over so she could talk to Katie instead, and after Katie began insisting that she knew she was wrong to doubt the story she'd been told and she had overreacted, Brooke dropped the bombshell on her that she wasn't wrong at all.

Now, Katie is heartbroken and feels sick to her stomach, because her worst fear of her sister and husband betraying her yet again has come true. And though she will certainly want to have her say when it comes to Bill as well, she will initially lash out at Brooke, because she will believe her sister started everything by confessing months ago that she was still in love with Bill.

Brooke will be upset when she realizes just how much Katie is feeling betrayed by the situation, and she could also see her own fears realized if Katie tells her that this time they can't come back from the situation, and she no longer wants to have a relationship with her sister ever again.

Meanwhile, Katie could also be formulating a plan for how she'll handle Bill as well. She previously warned him that if she ever found out he had betrayed her again with Brooke that she would not only keep their son, Will, away from him, but she would also take Spencer Communications from him again, but this time, she'd take everything, and not just the small percentage she took the last time.

The Bold and the Beautiful airs Monday-Friday at 1:30 p.m. on CBS.

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The Bold and the Beautiful, CBS, Soap Operas