I need advice about a friend possibly getting married.

My best friend of freaking 9–10 years now. He’ll be turning 21 this year. He and his current gf havent been dating for more than a year.

Today he texts me and tells me he has something important to tell me. Then he texts back with a picture of an engagement ring. I was totally shocked and didn’t know what to say. So all I could say was congrats and you got my full support.

Has this happened to anyone else? Where their friend maybe is rushing into something but you dont wanna ruin it for them or arent even sure where to even begin on the issue? Any advice or suggestions are appreciated.