He most likely just wanted sex.
It took him six months to contact you after the first one night stand and he only did it because he had recently broken up with his girlfriend.
The fact that he has yet to contact you since the most recent hookup is showing the same pattern of behavior.
Repeated patterns of behavior normally indicate that you are dealing with someone who is fully aware of what they are doing.
In your case, he is not really trying to see where things go.
He came over in order to hook up.
If you hear from him again, it would most likely be because he is looking for another hookup and nothing more.