I can surely relate to your problem... crushes are not much fun.. especially when you are bi, because then it's not just rejection you fear, but being 'outed' or ostracized.
Infatuation usually dissipates when you try to ignore it and offer your mind other things to focus on. Whenever you want to gaze her way... instead do something else --- talk to someone else, or return to being focused on your work. If you feel the need to see what she has been doing online... substitute something else in its place --- check your own emails... or once more.. busy yourself in work.
Basically, you will have to replace the actions motivated by infatuation with something that doesn't encourage it. Also, you will have to make an effort to not give into your feelings -- forcefully ignore them. In time, when you are no longer paying attention... the feelings will be reduced considerably --- back to being manageable, or even gone.
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen