Everly Brothers did it first..but there are so many good covers, it's hard to choose which one is the best. I do love Roy Orbison.. and Gram-you can't go wrong with Gram Parsons, he's a genius. I'm not a huge Emmy Lou fan, she has a pretty voice and all but I prefer Gram singing alone.
The Nazareth one is pretty damn good as well. I'm glad I can say Love doesn't hurt me anymore. I have no love for any boys these days. I do have crushes tho-esp boys with tattoos and motorcycles or old cars.