I'm female. I can't stop thinking about my best friend (who's the same gender as me). What's happening?

[Anonymous]

So, there's me (19 F) and this friend of mine (23 F). I've been thinking a lot about them lately, basically everyday. We met each other in school some years ago (she was a transfer student) and we started being inseparable. I can easily tell I could be myself around her, and I believe I didn't feel this kind of chemistry with anyone before.
Sadly, she stopped attending school, and I haven't heard of her ever since. But EVERYDAY I surprise myself thinking about how she was sweet, how fun were our conversations. Can someone tell what is happening to me? Is this some kind of obsession or what? Help!

[Sour-rose]

You just miss her. Aaand if it was an obession, you be smelling all of her clothes. Even underwear and watching her from her walls. I assume you ain't soooo soon your mind will most likely relax off the topic.