Garble did, technically. Dragon proposals aren't very showy. The one proposing basically states they wouldn't mind coming home to the other every day, or something similar.

The process of getting married itself is very simple too. The couple is married as soon as they both agree they are, which is why it is so rare for dragons to be engaged.

Dragons who agree they are married report their newfound marital status to the Dragon Lord and may hold an optional wedding, which many dragons do because they love to party. Though, dragons who appreciate their privacy may not opt in.