How the hell do I move on?

I really liked her but it’s blatantly obvious she didn’t feel the same, I initiated all our convos and poured my heart into our dates, she’d always reply hours late, she didn’t make an effort to know me. She even turned away once when I went to kiss her.

Our last conversation died and I haven’t initiated a new one in hopes she would (hopefully to show interest) . Been a week now haven’t heard anything.

This was the first person I’ve ever actually had feelings for, the first person I dated, and the first person I kissed. This has just killed me, I feel empty and heartbroken even though we only dated for 3 months. How do I move on…. I know there’s dating others but in twenty years, she’s the only person I’ve felt this way about. I don’t know how long till I would find another I feel this way with, and it worries me.
How the hell do I move on?
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