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Funny answer: One word - Threesome

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Serious answer:

I don't mind the fact that you have two girlfriends, even though I myself am monogamous, I know that many people are not monogamous. But people who aren't monogamous should at least be transparent about that fact with all partners, and this is where you come in.

The real problem is that you are going to end up hurting two people, which is unfair on them. I'm assuming as neither of these girls know about each other, then they are monogamous. They will get hurt if they find out.

I suggest to limit the damage that you cut it off with the new girl now, because it will be best for all parties in the long run. It will be a moment of sadness for her, but she will recover better than if you break up with your long term girlfriend, or both when they find out about each other (which they will).