Its a big shock to see that happen, so I can understand you wanting to pack in road riding, but I would suggest hanging on to the bike for a while and see how you feel in a few weeks, months, even years! The worst thing, would be you sell the bike and a couple of months down the line, you start to regret selling it and then your stuck with out, what is, a really nice bike, that, in your own words is a keeper!
Unless you need the money from the sale, sorn it, put it in the shed/garage for a while and see how you feel later.
Hope your friend is ok in the long run.