He also posted her picture, which is (1) somewhat inapprpropriate, and (2) makes him look even dumber, because she's absolutely gorgeous, and it sounds like there was nothing wrong with the relationship.
If you have to dump a good relationship with a beautiful girl, you're doing it wrong.
It's not, but it's all the information I have in this case. I don't know anything about her aside from her picture, included with the essay, and what's contained in the breakup letter.
Let's recap: he was with her for a year and thought he was going to marry her. She's very attractive, and they look happy together. I'd argue strongly that he'd need a very strong reason to break up with her, and the email doesn't provide one (although it does provide her with good reason to break with him).