My guy friend accidentally called me babe... He has a girlfriend?

Anonymous
Basically one of my best friends is a guy. We've been friends for two years and we tried dating in the very beginning of our friendship. It lasted a month and didn't work out. Figured we were better as friends. Anyway, he moved away and is in a serious relationship with his girlfriend. They live together and have been dating for a little over 6 months. I am very happy for him. He and I have kept up our friendship and talk almost daily - there has never been anything flirty or sexual (besides the time we tried dating 2 years ago). The other day he had called me to catch up - and in the middle of the call, he accidentally called me babe. Not only did he call me babe, he didn't apologize or take it back. I just laughed it off, but now I'm worried. Should I be? (he normally calls me dude or bro, like I'm one of the guys) Am I reading too much into this? I have never accidentally called ANY of my friends babe... (not looking to date him/ break up him and his girlfriend).
My guy friend accidentally called me babe... He has a girlfriend?
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