Most Helpful Guy
What might of happened is that since he is usually in control (this is what he is used to) and you was able to get him outside of his usual boundaries (out of control). Once the sex was over and all the blood ran back to the other head, he realized that he has lost control and you had control over him and that may have made him feel uncomfortable. He probably didn't know how to deal with that since it was not his usual self and doesn't have the mental framework and experience on how to deal with that. So he had to remove himself from the situation until he had some time to deal with his thoughts and feelings. So either once he had come to terms with what had just happened, or decided to just not deal with it at all and put it aside, he went to bed. Since he snuggled up to you, I'm thinking he may have come to terms with it at least on some small level.
You might not want to make what ever you did a regular part of your sex life right away, but you might want to try it again (or something similar) at some point in the near future to see how he reacts. Maybe things will be better the second time? If not, you may have to dig a little deeper with your questions instead of accepting a simple "yes" if you don't think things are really OK. Tread lightly though.. :)