Why would a man be hesitant to tell me that he went on a date?

Anonymous
Firstly, I realize that this may be a dumb question so please spare me of sarcastic and/or unhelpful responses. Anyway, here’s some context:

I work with this guy and we have a great (working) relationship. We talk and laugh all the time. This morning, I overheard him telling another colleague that he went out on a date this past Saturday and how great the girl is and how great the date went. Later on, I asked him how his weekend was and he didn’t mention the date at all. What could this possibly mean? Thanks in advanced.
Why would a man be hesitant to tell me that he went on a date?
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