What does it mean when a guy says you're interesting?

[snoopyashark]

It's hard to say whether it is good or bad.You should observe his behavior and speech style carefully because it can tell you whether he is flirtatious or sincere.

[Anonymous]

He likes you, maybe he should have chated to you a little first, flirted etc but you get the idea chat with him see how it goes

[2010atitagain]

Yes, take it as a compliment. Look up the antonyms of the word interesting.