I am torn between best friend and boyfriend...

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I am in the situation where I am spending more and more time with my boyfriend... We are close till people around me are starting to ask when are we getting married. = Problem now is i spent a lot more time with my boyfriend than my best friend. My best friend, though happy for me, is sad sometimes... As she sometimes think she has lose a friend.. Why? because I cannot be the close friend I used to be as there is someone else in my life.. I cannot be there for her. I cannot go shopping and movies with her as much as before. I do try to go out with her once in awhile. But she usually refuse when my boyfriend tags along.. She says she doesn't want to be "The Lamp Post" or the third party.. So there are times where she would "complain" or "nag" that how lonely she is at times, now that she has 1 less close friend.. Another thing is, our other best pal is away in Australia studying.. So she is all the more alone if you know what I mean.. We are those that has a few close friends by our side.. I understand how she feels. But there is nothing much I can do. Was wondering if I can find any advise out here. Have you been in this situation before? How do you "tackle" it?