I hope he's okay, too, but he should be :) When I got my first betta, when I was about six, he lived in a half-gallon with once a week changes, a scrawny plant, and a glass floating fish for five years. I know betta now, though (oh the puns XD ), so I keep my newer ones in bigger tanks with frequent changes, but they can survive in worse conditions. How do you think any remain alive at the stores that don't care properly for them?
On another note, do you have your friend's email? You can always email her asking if she wants to come over to your house to hang out, and just say somewhere in it that you were wondering how Thud was doing, and ask if she was still bored with him.