Enjoy being single
Go out, have fun, see the world and don't answer to anyone! The more you enjoy being single, the more likely you are to get over your unrequited crush. Feeling a sense of loss over something you never had is hard, so treat it like you've broken up with a long term partner. Go and get your hair done, buy a new dress and get out on the town. If it helps avoid spending time with your couple-y friends for a few weeks to soften the blow - there's nothing like single girlfriends to give you a fresh perspective.