| I would add a caution. AS A MALE, I would be suspicious of boys saying such things so quickly. It's the kind of thing a guy knows a girl usually wants to hear before she's willing to "do more" in private with him.
I know you didn't suggest this was the case. I bring it up as a warning. Simply put, at this point I would believe it to be mildly manipulative.
Also, he may mean it, and that could still be manipulative. So, you're going to have to say something. If it were me, I'd rather hear "that's sweet, thank you for saying that" than nothing at all.
If he follows it with inquiries about why you don't say it back, "Oh, is that why you said it to me, to hear me say it back? Wow, that's not very nice. I thought you said it because you meant it." | 
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