"I laid on my closet floor and just sobbed," she says

Brandi Glanville is opening up about the emotional fallout of her ex-husband’s affair in an emotional episode of Famously Single.

“I trusted him completely and fully,” Glanville, 43, says of her relationship with Eddie Cibrian. “Then I went to visit him on a movie set and for the first time I felt like something was going on with the person that he was acting with. He told me I was crazy. That morning I get a call from a bitchy mom that I’m not really friends with and she’s like, ‘Have you seen the [tabloids]?’ ”

“I laid on my closet floor and just sobbed,” Glanville says.

The reality star, who has two children – Jake, 9, and Mason, 13 – with Cibrian, now 43, admits that her motherhood responsibilities triumphed over her pain.

“It wasn’t about me,” she explains. “You buck on, so I did. I mean, don’t get me wrong – I had a couple years of depression. I started drinking too much, I had to up my anti-depressants, I cried all day every day, I lost too much weight, but I had to take care of two kids. It wasn’t about me any more. I knew it had to be done.”

Famously Single airs Tuesdays (10 p.m. ET) on E!