Could my dream be a premonition?

My boyfriend moved about 4 months ago and we are doing long distance. Today, i took a nap and had a dream. in the dream my boyfriend cheated on me with a brown haired brown eyed girl named Rachel. (if i saw the girl in person i would be able to spot her) when i woke up i asked my boyfriend if he knows a brown hair brown eyed girl named Rachel where he now lives. He seemed shocked and replied with "umm...yeah....why?" i didn't tell him about my dream. everything was so vivid. do you think it is just a coincidence? or something more?