<human>: Could you distill the essence of the text into 1-3 sentences?

This guy and I have been dating, but we're not in a relationship. We've talked about it, and he said he likes to take things slow and really get to know each other before jumping into a committed relationship. I agree with this, so I haven't really had any issues until now. 

As of late, we've been hanging out with his friends more and more. A few days ago, his friend said "Out of all the girls he's dated, you're the only one who I don't find annoying." When explaining this to another friend, the guy I've been seeing repeated it as "Out of all of my girlfriends..." It threw everyone in the room off for a minute because he usually doesn't say that word at all. I brushed it off after that night, thinking it was nothing. But then he explained it again to his brother tonight, and referenced me as his girlfriend twice in a ten minute period. This time, I was the only one thrown off. 

I really want to ask him about it, because I want to be his girlfriend, but at the same time I don't want to make things awkward or accidentally push him into something that he doesn't really want yet. How do I approach this?
<bot>: He [accidentally] called me his girlfriend more than once, and I want to ask him about it without it being awkward.