What does it mean when a guy avoids saying whether he has a girlfriend or not?

I saw a coworker outside of work with a girl the other day, I want going to say anything until he approached me saying he saw me with my friend and then I said "oh yeah, you were with your girlfriend right?" Then he avoided answering. Then later he said sorry for brining it up for some reason, and I was like "your good, I was just confused cause you didn't answer if that was your girlfriend." And he still didn't answer after that.

Honestly it's none of my business if it was or wasn't, but I'm just curious now why he was avoiding saying anything.

What does it mean when a guy avoids saying whether he has a girlfriend or not?
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