Why am I hung up on this girl?

I was talking with this girl for a while, and this was one of the few people I met where I really meshed. I really liked this girl and she seemed to feel the same way.
But she told me after our first date she wasn't truly over her ex and wanted more time. But she said I was the best guy she's ever met, and really wanted to date me. But after a few weeks, she became very rude and distant and I stopped talking to her.
But it's been months and I'm still hung up on her.
Why?
Why am I hung up on this girl?
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