Liberty Ross is "wavering on the idea" of whether or not to break ties with her husband Rupert Sanders.

It was revealed in July that Rupert had an illicit romance with his Snow White and the Huntsman star Kristen Stewart. Since then Liberty has been posing on the red carpet without her wedding ring.

The supermodel is reportedly unsure about taking Rupert back.

"Liberty is still completely undecided with what to do with her marriage," a source told Radar Online.

"At the moment she is concentrating on work, most recently returning to the catwalk for the Alexander Wang show last weekend at New York Fashion Week.

"But until she feels that she can forgive Rupert for cheating on her, the wedding ring stays off she is wavering on the idea of taking him back."

Liberty and Rupert share two children together.

Family is of primary importance to Liberty currently.

"She feels that he needs to put in a lot of effort in rebuilding her trust," the source explained.

"She's keeping him on his toes, not punishing directly for his actions, but making sure he could be a model husband and father to their kids."