Girl talks to me, then disappears for months at a time?

Met this girl from a different country, we talked for a while and got a liking to each other, but she has this weird habit where she just disappears for months at a time and then comes back and she's so happy to talk to me again, we've admitted feelings for each other and want to visit each other, she insists on visiting me, but I just don't quite get what her deal is, I do really like her but her behavior baffles me
Girl talks to me, then disappears for months at a time?
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