He could have said that because he is into you and finds a lot of things about you cute and lovely and sexy, etc..
OR, he could have said that just because the way you talk is cute.
If he's like me and says whatever he feels like saying when he finds something cute, adorable, beautiful or gross and ugly etc, than you shouldn't read too much into it. If he's not like thant, and is not too much of aq "complimenter", than I think he said that because he's interested in you.
Look for others clues, and you'll find your correct answer :)