I'm thinking of the girl I like the most rejecting me after a long and interesting history
Would it bother you if you don't know why she rejected you?
The reason is not very important, but it is likely.
If she does reject you, you should try to move on from it. Not everyone is going to want to date you so some rejection is expected.
I know, but I'm feeling hurt, I'm debating about attacking her online.
What do you think others will think of you when they find out you are attacking her online? Don't you think it is better to just move on?