Final answer:
Mary is experiencing jealousy due to the change in her husband Tom's work schedule, leading to less time spent together and a sense of threat to their relationship.
Step-by-step explanation:
Mary is experiencing jealousy. This emotional state is typically associated with feelings of insecurity, fear, and concern over a relative lack of possessions or safety. In the context provided, Mary's sense of losing her husband, Tom, due to his new work schedule, which results in him working later, points towards her feeling threatened by the change in their relationship dynamics and the reduced time spent together. Jealousy can drive individuals to believe that their relationship is at risk even without concrete evidence to support this fear. It's important to communicate effectively and address the issues when one partner in a marriage feels jealous, as it can lead to other stressors if left unresolved.