Does she like me?

It really all depends. You have to keep in mind you have only been in the relationship for three days. You have not really had the time to get to know what your current girlfriend is like. She may end up being the ideal girl for you. If you give the relationship time and you find that you don't think she is that great of a person, go for your friend. Because you already know what I'm guessing is a lot about your friend that you like, you will be able to decide if she is worthwhile. Just make sure she isn't interested in someone else before telling her how you feel. Also remember to relax because you are allowed to date different people and create new experiences. You aren't being an ***.