Happy relationship vs the new girl

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I'm in a nearly two year relationship with a wonderful girl. Things are going spectacularly and I could see us with a house and family in the future.

About two weeks ago I met this girl while out at a pub in town. We made an instant connection. That was a Thursday night. We swapped phone numbers and hung out on Saturday and Sunday for drinks and chats.

I'm certain we both have feelings for each other but here's where it gets complicated.

Both me and her are Christians, but we're both dating people who don't share our beliefs. Fair enough, not everyone wants to believe that stuff, we're both cool with it.
Her boyfriend lives in New Zealand, I live in South Australia and the new girl lives in Sydney soon to move to Melbourne (about an 8 hour drive or 2 hour flight from my town.

The reason I mentioned that we're both Christian is that after talking over the other weekend some of that faith stuff became the topic of the conversation and we realised that we can talk to each other about that stuff a lot easier than to our partners.

It seems I have a few options here...

1: I could keep the new girl as a close friend, which will probably happen anyway, not tell the girlfriend about any of this and keep it a secret.
I kinda dislike this because I haven't told anyone yet and it was making me feel sick today.

2: I could tell my girlfriend that I met another girl but nothing has really happened between us, and continue with option 1. This could potentially end the relationship that there is nothing wrong with, but I love her enough that she definitely deserves to know.

3: I could see how the new girl feels about a slightly closer (for her) long distance relationship and if she's keen then we could both end our current relationships and start a new one together. I could definitely see a stronger future with the new girl but theres nothing wrong with the current one!!!!