My DH had the same thing confirmed at the end of January. It is hard, but I am glad to hear that your DH is coming to terms with using a donor. Also glad to hear it has made your relationship stronger - we feel the same.
We went ahead with our (anonymous) donor on the same day as DH's surgery confirmed he had no sperm - but because we were prepared for that, we were happy as we could still do an EPU. In a lot of ways it does simplify things...we've definitely found the cause of our infertility, and we can move past it. Hopefully after two years of TTC, our baby is now just around the corner - and yours might be, too.