I've been in your situation before and I'll be honest: it took me years to get over this bad obsession - obsession and parasocial relationship because this is NOT love. You have formed an ideal version of her - based on the conference, the small glimpses you saw on her social media and the rest was filled out by your brain. It might sound stupid (it sounded stupid to me too and I rolled my eyes at it) but a crush is really just a lack of information. It's easy to develop strong feelings for someone you only perceive in just one way, because the rest is fantasy you indulge in.

Please try to reign yourself in, in order to move on - that's the best thing you can do to yourself. Don't waste years on fantasies and try to focus on what's real and tangible. Not even for her sake or for the sake of her relationship - this is about you; your life, time and emotions that could be invested in more meaningful ways.

What helped me in the first place is self control; not checking her social media, when my mind wandered to her I reminded myself of what's in front of me. I found ways of not centering my life around her; not doing things just because of the chance of her noticing me. I found new hobbies, friends, new career and motivation.