Bad Signs So Soon?

I recently realized that I have a major crush on my brother-in-law (my husband's brother). My husband and I have only been married for four months, and we've always had a rocky relationship (we either love each other or hate each other). My husband and I have not been getting along well for the last couple of weeks. I don't even know if the brother has any feelings for me, but I fantasize about him all the time. I'm afraid that, if given the chance, I might act on an opportunity to be with the brother. Is this a bad sign already for my marriage?

— Trina, 25

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