Whats happening here? If he's not into me, why drag it out and not shut me down?

me and boss flirt all the time and just get along well but i think I've messed up a bit. We were joking about a photo he doesn't like of himself and i replied "for what its worth, i think its cute" and he just replied with a load of the arkward face emoji. I asked him what he meant and he just changed the subject and continued chatting. I feel like he's constantly baiting me and then not really following through. If he's not into it, why doesn't he just shut me down?

Whats happening here? If he's not into me, why drag it out and not shut me down?
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