Dreams of affair with brother-in-law!?

Ok so I've known my b-in-law 5 yrs or so now. I used to feel a tad intimidated when around him in the beginning, then I grew very fond of him we got on extremely well on the occasions we saw one another and he used to say really nice things to me about how glad he was I'm with his brother etc if only is met him sooner etc. I used to feel like he was looking at me but with a particular look that was more than just a friendly glance?! And I had dreams that we got together although they were never sexual Anyway about a year passed and we only saw one another on family birthdays and that little, what ill describe as spark has gone, I put down now that the earlier "feelings" were due to his compliments nothing more. I have no physical attraction or ever have and this "fondness" has gone, I've not seen him properly for ages and had another dream we were all on a family holiday and his wife found out we were having an affair but promised not to say anything if we didn't do it again. I love ky fiance and have perfect children and the life I've wanted so why these dreams? They really get to me