What does it mean if a girl says she'd miss you?

A girl recently told me that she'd miss me if I weren't around anymore. She said this after I teased her. And the way she said it, she seemed to be thinking of a word before settling on "miss".

Now, here's the thing...to me, this kind of came out of nowhere. We've always been kind of flirty towards one another, but I mean, there were stretches of months where we'd go without speaking to each other. Heck, we just recently came out of a 5 month stretch where we hardly acknowledged each others presence. Then we started talking again. And it had only been 2 or 3 times since we started talking again that she said this. It's not like we talk on the phone or share everything with each other, just short bursts of interaction where we tease or flirt.
What does it mean if a girl says she'd miss you?
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