Most Helpful Girl
I am going to give an alternative to all the other repeated answers you will get to this question.
Maybe the fact you want to give them a piece of your mind is the reason they did it by text. I know everyone hates people who do this, but to be honest I had this done to me and I don't think him breaking up with me in person would have been all that better. It would have been awkward, I probably would have started crying and then he would have had to some how comfort me whilst making sure I understood it was over. I thought the same as you at first, but actually it was a lot better in a way, I could walk away and get over it in my own time. Sometimes there is a reason people can't do it face to face and you just have to accept that is the way it is, especially when everyone lives in a virtual world these days. What you need to be more worried about, is why the relationship ended, not how they ended it?