I am assuming that when you say he isn't interested in relationships, then that means he doesn't want one with anybody, correct?
If that's the case, I would take his comment to mean that he does actually have some feelings for you that he hasn't expressed. As to the depth of those feelings, I couldn't say. It could just be a mild crush, or it could be something more.
I would be interested to know why he doesn't want a relationship, though. Depending in his reasons behind not wanting one, there could be different ways to take his comment beyond what I've already said.
Dating usually means going steady. No sex until it becomes more serious. If he doesn't want to date you, it means he doesn't want to put in the effort and probably just wants to get laid with no strings attached.