Nothing more than you would think.
I liked her, became good friends with her. Got greedy for more, wooed her into liking me (with my super-slick casanova techniques

) We're together, then after like a month she calls it off for whatever reason. Now what? No friend anymore. Not even a distant friend. No friend at all.
Stay friends you'll be a lot happier in the end.
Adendum: Forgot relevant #2 :P : I'm really really good friends with this girl (different girl). I'm sure you know its impossible to be
just friends with a girl. Of course my mind wandered past "friendship" but I never told anyone. I found out she actually liked me. I restrained myself and did nothing, never let her know that I knew. After like a month, when she stopped liking me (girls are funny that way) we're still great friends. Over a year later, we're still great friends.
[/teen]
[ultra-tough future soldier]