Yes, it is possible that he is interested.
This may be why he asked you if you have a crush on him when you apologized to him for stumbling your words.
He may not have believed you when you told him no.
This may be why he is still looking at you.
Since you like this guy, you should start returning his eye contact with a smile or even start engaging in conversations with him.
This way, he may get to the point where he decides to ask you out.