Why do girls ghost so often?

Had a tinder date that finally went well. Girl was amazing in every way. We ended up spending a full 24 hrs together at both her place and mine. Said she wanted to meet up again and texted me the next couple days and everything. When the day came that we were gonna hang out, I never got a text back from her phone or tinder. Been about 3 weeks. My friend found her on fb and said she is posting and stuff so she has Internet (not stalking her or harassing her). Why didn't she just tell me straight up that she'd didn't want to hang out again? How can I stop this from happening again? Someone explain please.
Why do girls ghost so often?
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