I'm going to break off my engagement via text.
Why would you break up with your fiance via text message?
I just don't feel like that I can tell them this to their face.
It is natural to be afraid of ending a relationship, however, using text to let your partner know is inconsiderate to them. Meet face-to-face and go through your fears to finish this part of your life.
I was just emotionally worn out and don't have time to tell them in person.
Regardless of how worn out you feel, being engaged is serious and you owe it to your fiance to tell them in person. Don't you think they would feel horrible to receive such a text from you? I think you need to be more respectful.