When it comes to romance, everyone deserves to be completely and absolutely adored. Nobody should settle for less. I cannot tell you how much I mean this.
It's a necessary and wretched part of life to pursue someone who isn't as interested as you are; but as someone who's gone through this probably more than most I say: Get over it and dig deep to find what about yourself is lacking that compels you to carry on with that kind of rejection. Rid yourself of excuses about why the other person isn't fully exchanging your affections. Stop envisioning a future where they will adore you the way you think they possibly could.
I promise you'll be happier for it.
(I am writing this publicly to ensure that I see it again when I need it.)