Don't make a big deal of it. Dreams may dig up parts of our subconscious we don't normally think about, but dreams mostly just take everything in our life and mix it up randomly so it doesn't make logical sense when compared to our daily routine. If you had a mad crush on your guy friend or he wanted to get closer to you than just friends, then it would be obvious. You don't need a dream.
Maybe there's just sexual tension? Straight guys are like Harry from When Harry Met Sally, they just want to get into any woman's pants. It's hormones.
You should use your head when it comes to dating guys that have already been your friend for a while. If it doesn't work out the friendship is over too. But if it did work than that's the best of both worlds! Good Luck!
