I think he is hiding his feelings, does like you a lot, is a complex person, and there is also the undercurrent of your being smarter and helping him with school. You have a very complex relationship, with many interesting facets and several roles that you each play. Not every young gentleman would confess his love for a young lady who acts as his homework tutor. Some would and some would not. So that, too, is going on.

I think you are on the right track suspecting that he is saying exactly the opposite of truth in an attempt to hide his feelings. This is because when somebody does not care about you, they would not volunteer saying that - they would just not engage with you and pass by without as much as nodding their head. When a guy SAYS that he does not care about you, most likely the polar opposite is the truth. Imagine that he walks into a big auditorium full of students whom he knows just a bit but does not want to get to know better. Would he go from one student to the next proclaiming: "I do not care about you!" to each, until 15 minutes later he has made all the announcements and departed from the auditorium that by that time was full of very puzzled faces?

Mental undressing is something some guys do and others don't; neither case is a perversion.