IMO as a cranky old lady, this boy proved himself to be completely not ready for marriage, and thus the girl seems to have dodged a bullet. Of course, we only have HER version of the story, so there could be more to it than that of which we are aware.
In general, people need to man up and act like grownups in these uncomfortable moments in life. I “get” why a guy might choose the cowardly and less confrontational route. It is a difficult conversation to have with the girl. But there will ALWAYS be difficult conversations in life, breaking up, firing someone from a job, BEING the someone who got fired, telling one’s children unpleasant news,telling a friend when he is doing something hurtful, telling one’s SPOUSE the same thing, etc. And the sooner we learn how to deal with these unpleasant and uncomfortable moments that inevitable crop up in all our lives, the better.
Sending a text after 10 dates is just cowardly,impersonal, and makes the person who does it, look like a jerk. I know people who have done that after 2 or 3 dates, and perhaps that made less of a hassle for them. But when feelings are more seriously involved and there may already be a strong attachment, the person with whom someone is breaking up, deserves at least an honest conversation in person. It is just simple menschlechkeit. This cranky old lady has spoken.