There's so much more to life than finding someone who will want you, or being sad over someone who doesn't. There's a lot of wonderful time to be spent discovering yourself without hoping someone will fall in love with you along the way, and it doesn't need to be painful or empty. You need to fill yourself up with love. Not anyone else. Become a whole being on your own. Go on adventures, fall asleep in the woods with friends, wander around the city at night, sit in a coffee shop on your own, write on bathroom stalls, leave notes in library books, dress up for yourself, give to others, smile a lot. Do all things with love, but don't romanticize life like you can't survive without it. Live for yourself and be happy on your own. It isn't any less beautiful.
Not everything is supposed to become something beautiful and long-lasting. Sometimes people come into your life to show you what is right and what is wrong, to show you who you can be, to teach you to love yourself, to make you feel better for a little while, or to just be someone to walk with at night and spill your life to. Not everyone is going to stay forever, and we still have to keep on going and thank them for what they've given us.