Well one of my good friends was dropped earlier this year. She had been with her boyfriend for less than a year, but he still decided to go through it. When she told me about it, she just said that he talked about how much he loved her and wanted to be with her the rest of his life and then he gave her his letters. There was no ceromony or anything. He is a TKE, so i dont really know if they hold ceromonies, or maybe it is his chapter. Well about maybe a couple of months ago, they go in to this HUGE fight and what ended up happening was that she threw his letters back at him and they broke up!
I know this one had a bad ending to it, but if you are sure that you want to drop your girlfriend, then i wish you the best!
I hope i was somewhat of a help to you