Most Helpful Guy
Depends how long you've been together, my friend recently got dumped via text after a 5 year intimate relationship, in that sort of situation then yeah it's massively disrespectful, it mainly depends on distance, closeness, and how long you've been together. To me doing it over the phone or over text is a dickish move anyway just simply because you are hiding from there emotions.
Most Helpful Girl
Yes personally because that means he or she doesn't have enough courage to do it in person. Therefore you never meant anything to them and / or they were cheating on you and didn't what to face you !!!