Azolis, there are many good reasons to break an engagement. In my case, I found out that he was controling and secretive. He was working under another name. I found out (too late) that he never went to the yeshiva that he claimed to have. He grew up in EY and it was difficult to check.
Some one I know found out after the engagment that he was really very sick. No one told her before this.
Some one I know found out that his father beat his mother and he didn’t think it was wrong.
Someone my sister know forgot to check with Dor Yeshurun until waaaay into the engagment. They decided to break the engagment rather than take the risks.
There are many very, very good reasons break and engagment. Dont be judgmental.