Is it weird to call him pet names, even though we arent dating?

So i have a thing with this guy but we aren't together yet. We go on dates all the time. Tomorrow night he's taking me out, and its a "surprise" he says. I like him a lot. tonight we were texting and he was like goodnight babe and i was like goodnight baby. I just feel like its weird that i called him baby? idk. what do you guys think? i dont want to scare him off or anything. i really really like this guy..