The h is 25, the H is 300 and maybe immortal. I thought this might be New Adult, but it is straight up YA. These people are incredibly immature for adults and so far (30%) it's been nothing but "he loves me, he loves me not"...

Interesting premise bogged down by teenage-level romantic angst.

Don't get me wrong - it is NOT YA, but the characters and dialogue all belong in YA. It was difficult to get into the story because I was so distracted by the fact that it all felt very high schoolish.