Breaking up by text message is considered heartless, gutless, and impersonal. And if you spent any kind of quality time with someone, then a text message probably isn't the best way to end things. However, there may be certain circumstances when the text message IS appropriate. For example, if you only went out with someone once or twice, and most of your communication happened via text message, then maybe a text message is an acceptable way to break up. But again, consider the circumstances. If possible, practice a little more dignity and respect! (for yourself and the other person) and at least end your relationship over the phone, if not in person.