INTPs are no different than other men or even moreso, in that if they're into you, they're in your face 24/7. They can't get enough of you since you're like a concept they're obsessed with where they want to know EVERYTHING about you.
If one isn't willing to commit and has stated it clearly, believe it. Enjoy the sex but don't expect more. This doesn't mean that more isn't ever possible but it's a long shot in the dark.