Is my crush flirting with me?

So we were talking about how I haven't had my first kiss. He was shocked and the, I texted I'd let it happen now. Then he responded aww poor you. No kiss for you. And I jokingly said nooo and then he said u seem open. IDK WHAT THAT MEANS HUH? anyways i texted back mabye and then he hearted the message. IS THAT FLIRTING?