<human>: Give me the gist of the text in a nutshell

Reddit, before I explain the situation just let it be known that I know what I feel is terrible. I am riddled with guilt because of it. 

I love my SO, truly and deep really do love him. I can see us spending our lives together. My SO and I have been dating for two years and we recently moved in together. His brother also lives with us (a temporary arrangement b/c the brother was recently laid off from his teaching job and can't find work). My SO and his brother look very similar, and I am physically attracted to my SO's brother. 

On occasion, I have lusty thoughts about him. I stop myself once I realize what I'm doing. I am so disgusted with myself. I have even considered that I should break up with my SO because it kills me that I have these thoughts and he deserves better. I literally get a lump in my throat thinking about how bad it would hurt him if he knew. But I just love him so much, he is my best friend I do not want to end things with him. 

My SO and I have basically no relationship problems. We never fight, our love life is amazing, and we are best friends and share so many interests. I would give anything to not be attracted to his brother. I know he is not like my SO and I would actually never want to date him, ever, because he is not my type. It is pure lust there are no actual feelings there. I am so ashamed that a small part of me wants to fuck his brains out. I HATE MYSELF. Please Reddit help me! 

How do I make these feelings go away? How to cope with this lust?
<bot>: I hate myself because I can't stop lusting over my SO's brother. I need suggestions as to how to stop and suppress the thoughts/feelings.