Is it normal to have a dream of kissing my friend?

Well, I have a boyfriend of about a year, and we've been really happy. Recently, we became friends with these two guys, and they're really fun. One of the guys is really similar to me, and we became close quick. Recently he told me he got a girlfriend, and I was really happy for him, but I also felt a little bit sad, and was confused. Well, the other day, I had a dream of him kissing me, with roses everywhere, and I woke up with my heart racing, and lots of guilt. I have a boyfriend, so why am I thinking of someone else? IIN, because I'm worried it might not be.