Armstrong received a scholarship to study at the Herbert Berghof acting school in New York City and wanted to emigrate to the US. In order to work and obtain residency, Armstrong and Robinson agreed she should marry a US citizen, so the couple divorced and she married, Alexander Bernstein, a friend and fellow actor. Armstrong only had a professional arrangement with Bernstein, but her long-distance from Robinson dissolved their relationship. In early 2018, she described the relationship with Robinson, "I think everyone should hold on to their first great love and be grateful... I know there are no accidents because I have come out of it with these three absolutely gorgeous young men as sons."