There could be several reasons why the man at work has changed his behavior and stopped telling jokes to you:
Change in mood or personal circumstances: People's behaviors can be influenced by their emotions or personal life situations. If he's going through a tough time or feeling down, he might not be in the mood for jokes or light-hearted interactions.
Workload and stress: Increased work responsibilities or stress can also affect how people interact with others. If he's been busy or feeling overwhelmed, he might not have the mental space for casual conversations or jokes.
Feedback or perception: It's possible that he received feedback from someone that his jokes were not well-received, or he might have sensed that you were not as interested in them as before.
Work dynamics: Sometimes, people's interactions change naturally over time. Perhaps he's trying to be more professional or create a different impression at work.
Social dynamics: Social interactions can be complex, and changes in how people interact can be influenced by various factors, including dynamics with other colleagues or shifts in the workplace atmosphere.
Personal boundaries: It's possible that he noticed you seemed less receptive to the jokes, and he's respecting your boundaries by being more reserved.
Fear of misinterpretation: In today's workplaces, there's increased awareness of appropriate behavior and avoiding any potential misunderstandings. He might be exercising caution to avoid any unintentional offense.
It's essential not to jump to conclusions about the reason for the change in behavior. People's actions can be influenced by many factors, and it's not necessarily a reflection of your actions or personality.
If you are concerned about the change in dynamics or if his behavior is making you uncomfortable, you can consider having an open and respectful conversation with him. Approach the topic casually and express your feelings without accusing him. This will allow both of you to understand each other's perspectives and potentially clear up any misunderstandings.
However, if you're not comfortable discussing the matter directly or if his behavior becomes inappropriate or bothersome, don't hesitate to speak to a supervisor, manager, or HR representative about the situation. Your well-being and comfort at work are essential, and they should take any concerns seriously and address them appropriately.