Hope I have the right thread for this post:

I've been with my finace for the past 12 years. For the past month I've started having sexual dreams about my best friend (male). Some people say our dreams mean something. While others say we have no control over them. I feel like I'm cheating on my fiance because the dreams are so vivid that they almost feel real. I wake up and can't stop thinking about having the dreams and what do they mean. I thought about talking to him (my fiance) about them but am afraid it will hurt him and cause problems. Any advice is more than welcomed.
Thanks! Sarah