Things to consider:
What feels right to you?
Are you you sure you're not just infatuated with the concept?
Do want to be safe or adventurous?
If you got to know her more, would you still feel the same way?
Are you completely happy with your current girlfriend? Could it maybe be time for a change of pace?
You could lose both of them
What are your values? Would you consider cheating on your girlfriend in order to see if things work out? (wouldn't recommend it, but I don't judge)
Where do you see the relationship with your current girlfriend going? Would you marry her?
Do what you will, just do what feels true to you.