Anon, The exact same happenned to me. I liked a girl in highschool, five years afterr seeing her last time, I dreamt about her, and then, a week later, as I am getting drunk in a bar on a Friday night, I saw her entering. Fun fact: she was single. We are marrying next year.
I have never believed in abnormal shit, and I'm not saying it will happen to you, it was more than likely a cosmic coincidence, but you know, sometimes shit happens when you don't expect it to get better, but it does, it is all a big dice roll and there is nothing we can do to control it, just buckle tight and enjoy the ride, today you are blue, tomorrow you don't know. Be yourself, learn to love yourself and to take care of your mind and then someone will come.