I had a somewhat similar circumstance. My best friend from High School and I chose our college together and became freshman roommates. We were always very different people but, you know, in high school it didn't really matter. When we got to school we did everything together...eat dinner together, take classes together, go home on the weekends together..it was sick really. Then I met some of my guy friends and she met a guy back home and we started to drift apart. She got angry because I would hang out with my guy friends every night, but I was only doing that because she would spend all night on the phone with her new BF (who I didn't like at all).
Anyway, to make a long story short, after we signed housing papers for the following year, she decided she was unhappy and was going to transfer to a school near home. However, she didn't tell me this, she just kept her mouth shut. One night I had it with her attitute and called her out and she admitted that she was going home but didn't tell me because she didn't want to "spend the whole last month together fighting." I figured that once we got home everything would be okay but it just got worse.
Sometimes it's better to just cut so called "friends" like that loose before they pull you down with them and have you feeling like you've done something wrong. I understand that you miss having a best friend, I do too sometimes, but waiting around for a rare and far between e-mail or phone call isn't a friendship. You're better than that!
