Is speaking something into existence an actual thing?

Okay something really creepy happened to me today. I was at Uni with my friends. We were walking to the cafe area and i saw this girl who looked like my ex boyfriend's ex girlfriend (the girl he cheated on me with). It wasn't her even though she reminded me of her.

THEN, after Uni when i was waiting for the bus, on the opposite side, I saw yet ANOTHER girl who looked like his ex and i had to put on my glasses to see if it was actually her or not. It wasn't her, yet again. I was even with my friends at the time and i asked them if they thought it was her and they said it "definitely wasn't".

So fast forwarding a couple of hours later, i was walking home from the library and just outside my block of flats, guess who is standing there with her friends? HIS EX. I felt sick as soon as i saw her, and i even almost broke down when i got to my room.

So, what do you make of this whole situation?

Please, i really need answers, because it could be a case where i thought/spoke it into existence, which is a scary thought, because i also always have thoughts of them getting back together, which i always try to shrug off, but it would be my worst nightmare, as I have hope that me and him will rekindle.