Alliances seem to shift overnight on the Real Housewives of Beverly Hills, but Brandi Glanville and Lisa Vanderpump have always been as thick as thieves... until now, it appears.

In next week’s all-new episode of RHoBH (Season 4, Episode 15), Brandi opens up to Kyle Richards about the state of her friendship with Lisa. Having gone through her own problems with the British housewife, Kyle knows all too well what Brandi means.

“I am used to getting my morning phone call from Lisa Vanderpump,” Brandi explains. “We discuss everything under the sun and what happened last night and what’s going to happen tomorrow. [But] when things kind of started to go south for me, the calls were trickling off.”

“Friendship aren’t a chess game,” she continues. “They don’t make sense all of a sudden. I just don’t understand how she can go from hating you almost to having you back.”

Sadly, Kyle doesn’t have much in the way of advice to offer Brandi. “If we’re going to be in the same circle of friends, I want to be able to get along. But I always know who Lisa is and Lisa’s never going to change.”

Watch this sneak peek from Season 4, Episode 15 (airing Monday, February 10), then let us know your thoughts in the comments below!