Have a break
The idea of parting from your unrequited lover might seem unthinkable, but you really will benefit from some space. It's not healthy to be constantly surrounded by the feeling that he doesn't 'want you'. What you need is a big boost of optimism, so go on holiday, have a weekend away or spend time with the girls. Don't call them, don't visit places you've been together and delete cute pictures off your phone. Spend time reflecting and moving forward rather than reminiscing.