Why did my best female friend just stop talking to me for no apparent reason? Ladies please help and way in ?

Anonymous
To start off I became really close with a female friend of mine and yes I really liked her but she had a boyfriends so I never told her how I felt because I didn't want to mess her relationship up with him even though he was horrible to her. She would break up with him almost on a weekly basis and get back together with him. Of course I was always there for her. Her boyfriend hated me because her and I did everything together and were always hanging out. In 2004 I joined the NAVY but I wasn't scheduled to leave for boot camp til 8 months later. When I signed up I told her and she was like no I don't want you to leave. Fast forward its like 3 weeks before I'm scheduled to leave for boot camp and somehow she convinces me to pick flowers with her. This is when I knew I was beginning to fall for her. I was hoping she would tell me how she felt the same way cause I would have gotten out of my NAVY contract. Now it's the night before I leave for boot camp and I'm in the hotel they put me in. I talk to her on the phone for like an hour and she told me she had to be up early so we hung up. Then like 30 minutes later she calls me back and has her dad talk to me and try and convince me not to go to the NAVY> He talked to me for about an hour telling me not to go and saying how he can help me get a job and all kinds of stuff. Of course by this time it is to late for me to get out of my contract. Had she have done this a few weeks earlier I would have been able to. While I was in boot camp I wrote her every week when we were able to write letters. Whenever I got a phone call I called my mom and I called her. Then I go to A-school which is where I learn my job in the NAVY. I called her about twice a week. After A-school I came home and the next day I went and saw her and I didn't know how to tell her how I felt. Well the last day I was there my best friend convinced me to tell her so I went to where she worked and she wasn't there. I tried to call but she wasn't picking up her phone. Fast forward a few weeks and I'm at my stationed in Washington state and I finally get my phone. I called her and we talked for a little while. I told her look this if the first time I have been away from my family and I asked her to call me on Thanksgiving. She promised she would call me. That was the last I have ever heard from her and that was 5 years ago. Recently I have tried to add her on facebook but I get denied. Just yesterday I sent her a long email basically saying all the good times we had together and just telling her I want my friend back. Ladies hopefully you can give me some insight on what you think. Thanks.
Why did my best female friend just stop talking to me for no apparent reason? Ladies please help and way in ?
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