am i losing my best friend?

since i was about a month and a half i've been best buds with anna. our parents were friends so we were always together. we went to the same daycare, elementary school and we lived across the street from each other. in kindergarten we would tell people that we were sisters. i remember during the summers we would spend weeks together playing house and playing barbies. we could finish each others sentences. i called her mom my 2ND mom. i didn't even bother ringing the doorbell...i was part of the family. nothing was holding us back. then she moved.... (she still lived in the same town, but she was out in the country) then we started making new friends....then we were busy with different sports....then boys....then we don't have the same classes. Now i see anna at lunch and that's it. the last time we hung out was August. it's now the end of October. we used to tell each other everything, now she has a boyfriend and she didn't tell me until a week later at the lunch table with everyone else. if i got a boyfriend i would call her up the second it happened. are we really starting to go our separate ways? we used to talk about our weddings and how we would be each others maid of honor and getting old and still lived right by each other. now we don't even talk like we used too. it's ripping my heart to even think about losing anna. i feel almost in a daze and not comprehending this. last night i had a talk with my mom about this and she told me that maybe we are going our different ways. but we can't be!! i need anna, she's my best friend, the one person who didn't judge me. am i losing her?