I don't do the girlfriend thing...What does that mean?

I was talking to this guy my friend had set me up with and he says, "I don't do the "girlfriend" thing." I asked him what he meant but he never really answered my question. He replied, "I don't like to answer the "girlfriend" questions. I just shrugged it off but now it's bothering me because I don't know if he was implying that I was asking too many questions or if it meant something else. What does that mean to you?
I don't do the girlfriend thing...What does that mean?
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