Hey, make up your mind.

Do you want to stay with your girlfriend or not? Obviously not, so I suggest you start being honest about that and tell her.
Then do what your heart tells you to do, although I can't really understand how you could ever switch from one girl to another so fast..
But that's your decision, and this is just my honest opinion. Hope it helps you, although I don't see why so many boys want a polish girl as of late, I have no bad thing to say about the girl you mentioned, don't get me wrong, but they're just girls like any other girl from any other country. But hey, if she makes your heart sing.. Go for it.

You know? Anyway, I think your girlfriend doesn't deserve to be lied to, wouldn't you agree?
Trust me, I know about lying all too well, and I know it hurts people's feelings. You should be clear about your feelings.

That's all. If you really like the other girl, you should really break up with your girlfriend and ask her out.
If she turns you down at some point, you'll be single, but that's only fair is it not? Either way, don't treat your girlfriend like that, if you ever liked her, then you'd know she doesn't deserve to be left in the dark.
