At one of the promotional events for Chrissie Chau's new film, Break Up 100, she revealed she was touched to hear people sharing their break-up experiences.
Hktopten reported that the star shared she found out her ex was cheating on her because of a tube of lipstick.
She added that she still kept that lipstick to serve as a warning for herself.
She said: "A long time ago a 'boyfriend' complimented me on my pretty lips, which he said was suitable for this lipstick.
"Finally I discovered on a bill that he actually bought two tubes. At that time I lost all trust in him. "