No offense, but what does this have to do with meeting her online? If she did this to you within the first day or two, I might understand. But you dated the girl for *6 months*.
You could have just as easily met her in the mall, a bar, the grocery store, etc.
If a girl is gonna do that to you, where you meet her doesn't really matter. It's how long it takes you to figure out what she's doing, that counts.