Why wouldn't my best friend tell me he had a girlfriend?

Anonymous
We were going to the movies on Friday but I would never ask him if I knew he had one. When I asked him when he was free, he mentioned a few days but I didn't know those were the days he was going to be with her... when I asked him about her he was like "I'm not the kind of guy who makes a big deal out of girlfriends, there is nothing special about them", what does this mean?
Why wouldn't my best friend tell me he had a girlfriend?
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