I have a serious infatuatiion with my brohers wife how can I see past this?

my brother has been married to his wife for 5 years and I just cannot stop thinking of her in a ual way at one point when they first met he went back to his wife and blew her off so she wanted to be my freind I knew there was no chance for us and that was it my bro left his wife and married her she knows the way I look at her and how attentive I am towards her every action and then I am the one she gets mad at the most can has this happened to anyone before what should I do.