If a boy likes me and i rejected him but now I have a crush on him so what should I do?

If you have developed a crush on him after initially rejecting him, consider reaching out to him to express your change of heart. Be honest but gentle; you could start by acknowledging the previous rejection and letting him know your feelings have shifted. Gauge his response and see if he’s open to exploring a connection. Remember to be prepared for any outcome, as he may or may not feel the same way now.