That means that maybe your girlfriend or you are too busy to talk to each other or maybe she just wants to be alone for sometime and doesn't wish to talk to you. Maybe she's just too busy to talk to you or, if she continuously ignores you then ask her why nicely and she'll tell you!
Sometimes people just grow apart, Maybe she is not as interested anymore? Try talking to her about the issue and see how she feels about it. No one wants to be in a relationship where they are ignored.
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