I need help Watch
Hi there, I'm sorry about your situation. It might be a good idea to take a step back for a little while and get a bit of space, just to give yourself time to let go of the feelings you're having. Of course you can still be friends, close friends even, but spending some time with other people or even trying to meet some new people will begin to help your thoughts not be completely pinpointed on her and widen your focus a little.
Again, maybe the key is just spending less time with her. The most effective way I've found is spending less time with the person you feel that towards, and just widening your circle and doing more to focus on yourself. You shouldn't completely cut her off, especially because you have such a good friendship, but you just need to do things so that she's less at the centre of your thoughts/life/etc.