How long does flirting last and what's it all about?

I was talking to someone nearly every for over a year. They commented sexy on my photos, told me they'd never met anyone like me. Constantly laughing at stuff I said. Really laughing. Laughing and taking the piss our of my photos. Sending photos in bath. The view of legs and bath. Talking about sex. Saying she had a sex dream about a man my age, I was 19 years older, asking the youngest I'd date etc. If I said anything back, she would go quiet. When I sent gifts she would ghost. This went on over a year. Then she disappeared for good. I don't get it.

How long does flirting last and what's it all about?
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