Boyfriend called another girl baby?

Last night me and my boyfriend were out with a bunch of friends. All of his closest friends refer to me as his girlfriend and they know we're together, and he has no problem acting like it when we're out with everyone. We were sitting together and one of his girl friends handed him something and he responded to her by saying "thanks baby" and I was slightly caught off guard. He's got a flirty personality but I'm not worried about him cheating on me at all, but I thought that was strange. He's made similar comments before to other friends of his that are girls, and it's always in that context. I've heard that if a guy was really trying to be shady or flirt with another girl, he wouldn't do it in front of me. He's told me he loves me and he really does act like it, I just think it's a strange thing to do in front of your girlfriend. Am I being naive or am I justified for finding that strange? Thoughts?
Boyfriend called another girl baby?
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