Birthday presents: Part 2

He went on a date today and I realised that we'd never be together. He sounded so happy after the date when he called me.
I can't wait to walk round the park tomorrow and hear all about the beautiful person that makes him happy. I will always support him and share his successes no matter what. I feel that's more important than a short-lived romance anyday.
So dear friends, I need to finally let him go. Why does it feel like a heartbreak when he was never mine to begin with?