Hi, I am going through the same thing. It has eased a bit as it isn't reciprocated and I am not in a position to reciprocate anyway. Issue is I see this person a lot as she is a work colleague. We built up a very strong bond but now it has deteriorated. I kind of feel a bit used but that's just because she started to distance herself away. If you stay connected you will become less infatuated as you realize their faults etc. However this is tough as you see and hear what they doing. The key is to act like you don't care, keep yourself really busy and focus on the people that really matter in your life or people who like you back.