For the first time in my life, I have moved in with a guy. I think I love him. But I am deeply disturbed to find he sometimes orgasms in his sleep.

I feel rather insulted by this. Is there something wrong with him?

No. You clearly aren't aware it is normal for most younger males - and some older ones - to reach a climax while they are sleeping. Your bloke has absolutely no conscious control over this phenomenon, so he is certainly not being unfaithful to you in any way. And there's no need to feel insulted.