I had a dream about a guy on holiday, what does this mean i can't stop thinking about him?

He had a strong attraction to you which you noticed so obviously you'll dream about him, most dreams are due to unresolved emotional issues, and your mind will create a fantasy which will create a similar emotional reaction to the emotion you haven't dealt with in your waking life. The fantasy in your dream that your mind creates is usually loosely created from events you have recently experienced. You'll probably forget about him in a while.