Lost some friends along the way

It's basically obvious as to what will happen to have your friendships in high school once you graduate. You probably wont even hear from half your "best friends" after you go off to college. It's not a deviant way, just a way of life and growing up. You should feel blessed that they were even in your life at all and not dwell on the fact that you don't speak anymore. I feel horrible that I don't take twenty minutes out of my day to call some of my best friend's I've had for years. I just honestly feel so busy. I really wish I had more time off and to spare so I could go down to Waynesville more often because I hate not seeing family and close friends. Even here in Springfield, I'm completely content not talking to that many people. Basically, right now I just call my mom, my room mate, my boyfriend, and one other friend up here. I actually like it that was. It's less stressful for me.
Last summer I made one of the best friends I have ever had. We were inseperable. I basically lived at her house for the summer. We would go to the pool, parties, shopping, and she even stayed with me when I got my new apartment in July. We were so excited for college because she would be going to MSU while I went to OTC. Yeah, I havn't seen her since she went to school. It really erks me when she says it's awkward now because we don't talk. Who's fault is that I think. I really hate it that I lost her as a friends. I especially hate it because there was no reason for us to lose contact. We are only like three minutes apart and were about 15 when we lived in Waynesville. She just didn't have time for me. It bugged me though because I work and she has no job, yet I put in effort. I know it's not just me though because she only hangs out with the same two girls she has since she got there and is content with that. Well, I'm content with how things are too. I just hate how I lost that friend for no reason.