Attracted to brother in law :(

I've been with my husband for 6 years, we have two beautiful children, currently trying to concieve our third.
I've never been unfaithful at all, but I've been faced with a conflict, I'm attracted to my brother in law. 
I've been around physically attractive men before and they are just another person, but for some reason I feel something for him, that I don't want to feel! Being around them can be awkward because I will try very hard to distant myself and make sure I watch my body language and what I say because the natural reaction to someone you're attracted to is to flirt and it's stressful! I don't want feelings for him!
I hate this feeling and despite my efforts I can't stop it! 

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