it's not the strongest adaptation but 8 episodes isn't a lot to work with.
Maybe it's the acting for you? For me it was the way the story was told as in I never really invested in the characters to 'feel' the separation and love as it was drip fed to us. But I felt the same with the manga to be honest
You've got a couples photo of you both in your wallet though!
Famous last words Joke
also 2nd BL where High maintenance has been used to describe a main character (Jun&Jun)