IMHO, this is a problem of incompatibility. Sometimes no matter how memorable your relationship with another, you still have to let go because you both have met the wrong person in your life. Letting go a memorable friendship like this may be painful, but it is worth the pain for some time rather than to bear the pain of continuing your friendship with her. If you want to continue your friendship with her, it really needs some time to have some adjustment. This is not going to be easy. The decision is yours and I believe we have tried our best to give you the best advice. Thanks and Regards.