Seriously, he broke up with his GF in an email?
If you have to dump a good relationship with a beautiful girl, you're doing it wrong.
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).