Compromised (1931)

Poor working-class girl Stella marries wealthy Sidney Brock, recently jilted by his fiancée and social equal Connie. The two go through contentious times with the Brock patriarch, but when Stella becomes a mother, she seems to becomes accepted, although it's used as a way to shift Sidney's and the child's affections from her. Connie comes back into their lives, now seeking to reclaim Sidney, and manipulates the situation to convince Stella that he's been seeing her. So Stella decides to get a divorce, but fortunately, Sidney becomes aware of the deception in time.