My bf called me his fiancée today!!!

So me and my bf have been dating a little over a year and yesterday when he took his car to the mechanic the guy working there asked me if I was his fiancée (maybe jokingly because he knows we’re young?) and he laughed and said yes!!!! We’re still young, and we’re not getting married anytime soon but it still made me so happy!! Do y’all think this means something or am I just overthinking this to mean more than it actually does?