This is a great scene from the movie Stepmom. Notice the difference in body language.
Julia Robert’s character is uncomfortable. She’s a bit fidgety at the beginning and makes less eye contact. She looks down often and smiles to mask her feelings.
On the other hand, Susan Sarandon’s character is more sure of herself. She has a more upright body posture and rarely breaks eye contact. When she is crying there is no smile. She doesn’t feel the need to hide her pain.
Let me know what you noticed!