"We are grateful for the years we've spent together and believe wholeheartedly that we did our best," Yolanda and David Foster tell PEOPLE

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Yolanda Foster has the support of her fellow Real Housewives of Beverly Hills after announcing the end of her marriage.

Current costar Eileen Davidson and former cast member Adrienne Maloof both took to Twitter on Tuesday to offer their well wishes to the former model, who told PEOPLE exclusively that she and her record producer husband David are divorcing after nine years together.

“I was so sorry to hear about @YolandaHFoster and David. My love to them both,” wrote Davidson, 56.

“Sending positivity and love to my friend @YolandaHFoster during this difficult time,” tweeted Maloof, 54. “I am always here for you.”

In the Bravo reality show’s season 6 premiere, the Fosters’ relationship showed signs of strain: Yolanda, 51, told the camera that David, 66, kept up a busy traveling schedule as she fought Lyme disease, though she defended her husband.

“He’s a man. He needs to work. He has a career,” she said. “He travels. He does charities all over the world. It’s been like that since the day that I met him, and that shouldn’t change because I’m sick.”

But a source tells PEOPLE that her ongoing health crisis took a toll on the couple: “They just grew apart and the intense stress over her health and the disease was very hard on their marriage.”

RHOBH airs Tuesday at 9 p.m. ET on Bravo.