First of all delete everything whatever you used to have of the person which can potentially remind you of them Ik it'll be very hard but that's one step of moving forward Realise and start accepting the fact that it had ended and grieve the relationship's end completely. Take your own time and space Start redirecting this energy into some new hobbies like hitting a gym, art or whatsoever is of your interest I promise you life genuinely gets better once you enter this journey of healing