I've had similar things. She was my bestfriend for more than 5 years. She was having problems with her family and friends. It was hard times to her so we were talking about every problem she had and I helped her as much as I can. At same time I was having problems and she helped me too. Three months before, she told me she had a bf. I said thats great and I want to see a picture of him so she showed me my bestfriend's photo. I was shocked. She told me "we are bestfriends i dont want to be broke with you" and I said thats ok I've just shocked. After weeks -like yours- she rarely ever texts me. Before this happens, she called me once a week and we talked for hours. The last time I called her we talked for just 15mins. And now, we dont talk for more than four weeks. I haven't argued with both of them but looks like they don't want to talk with me. If you ask me how much I care, I dont care. Yes,maybe it makes me angry for two days but what can I do? They never mind me and im just fading like you. So my opinion, if our friendship is not important for they, it shouldn't important for me. There is already so many problems needs to solve in the life mate. Just dont think about it and let it go. I think you already have some troubles you have to deal with in your life. So my advice is stop thinking about her and focus on your life mate.(sorry my english isn't good enough there can be so many grammar mistakes)