What makes a guy so secretive about his job?

I’ve been dating this guy for about 3 months. He is very good, funny, caring, sexy and really smart. Very stable Financially & I’ve fallen in love with him due to his charming personality. He surprises me with different fun romantic dates every time and we get along perfectly. We talk about so many things and he is open about anything I ask about except 1 thing. His JOB whenever I bring it he changes the subject, or say there’s nothing much to talk about, and it’s bothering me now cause I really want to know!! Am I overthinking this thing?

What makes a guy so secretive about his job?
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