Don't worry, im sure he'll forgive you, personally it wouldn't bother me if they let it go once they knew how i felt.
i really dont understand the question at all who did what to who now? who are we forgiving & for what? anything can be forgiven..if your willing
She has a crush on some dude who has a girlfriend and she told him and he doesn't like her back, so now she wants to know if he will forgive her.
He has nothing to forgive you about, you have made him happy. He is not able to acknowlege it properly though, and things may be a bit awkward. I Imagine that if his girlfriend has been told, she will not be as forgiving, and he may feel obligated to act mean even if he doesn't feel like it.