His fiancé went off on me

I have been friends with this guy since freshman year of high school and we’re 26 now. I decided to message him on Instagram just to catch up and see how he’s doing since we haven’t talked in like a year. I said “Frankieeeeee Lopez! how have you been?” (Ive always called him by his first and last name) And I guess he’s getting married soon because I got a message back from his fiancé going crazy on me for speaking to him and she said “he’s busy planning music for OUR WEDDING”. We aren’t super close anymore but we did have a little fling freshman year and just remained friends since. It was a high school crush thing. Not even anything serious. We also don’t even live in the same state anymore. I don’t know what to say. all I did was say hey to an old friend. There was zero indication that he was getting married and I didn’t even know he was dating someone. I’m not trying to get with him or anything. Is it inappropriate to catch up with old high school friends? Her friends are now trying to follow me on Instagram.