Mate, can you please rephrase the question. I dont understand it.

I am one of those who would get all defensive at first. My husband never knows how to start a statement. But, just tell her straight up. Tell her you are worried about something that has been going on between the two of you. When she asks what, and she will, start with the popular "I feel..." and end with a "is there something I can do to help this situation". She might not even know she is pushing you away. Sometimes engagements are scary and people unententionally pull away. Good job trying to keep communication going. You are right. It is essential to a healthy relationship!

Communication IS key, but we have a lot of bad ideas about what communication is. Communication is NOT telling your partner every thought or feeling you have. Communication is NOT dumping your anger, anxiety, or jealousy in their laps. When you say it feels like she's pushing you away, what does that mean exactly? What is she doing or saying -- or what are you expecting that she's not providing? The most important thing in a relationship by FAR (like, about 10-to-1) is NOT communication, it's self-awareness: knowing in detail what your actual thoughts and feelings are, and being able to see where they're coming from (usually: your own past). Almost all the books on relationships are wrong about this most-important-thing issue. Until you have clarity into your own feelings and thoughts, and can distinguish the part that you're adding from what your partner is actually saying and doing, most of what you'll do in an effort to "communicate" is just complicate the relationship by dumping your content onto your partner for them to solve. That is not their job: they are not your therapist. So before you worry about what to say to your fiance, spend some time with yourself (or a friend) getting very clear about exactly what is happening with you. When you can explain it to us clearly here on the bag, you may be in a position to start talking to her about it.