Gf's Facebook always says online should I worry?

[Ryan]

If she's using a computer to be on facebook and doesn't close out of the browser, simply walks away from the computer, and the computer doesn't go to sleep then it will show her on even when she's not. Or there's a number of other reasons why it would do this. Maybe she's embarrassed to say she's up all night looking at funny cat pictures, I've done it.

The real question you should be asking is why is this such a big deal? She's your girlfriend, you have her phone number. If you want to talk to her just call her on the phone instead of sending a message on facebook and waiting. You starting a fight over something like this is a very chick thing to do.