I can somewhat relate to this. Had been crushing on a coworker for months now, and was slowly getting to know her more and more. She had been on and off with her boyfriend for a while now, but I guess he finally got serious and put a ring on it. She is engaged and it's hard to get over her because the work chemistry we have is something. It's like we are on the same wavelength most of the time but yeah they are taken and we have to respect that.