“I had a dream that my boyfriend raped me and I woke up crying next to him because it wasn’t re asdfadsf ”

I had a dream that my boyfriend raped me and I woke up crying next to him because it wasn't really him. He'd never do something like that. I got over it, because I know it was just a dream. He's still upset by it though and isn't feeling sexual around me because of it. What can I do to help him? How can I help him acknowledge it as only a dream, like I do?