I feel bad that I told a lie to my brother

I feel so bad that I lied to my brother. Last week I was with my brother and he wanted to know if I was interested in his wife. I told him no the truth is I am very attracted to his wife I I believe she’s attracted to me also. I’ve been stopping by their house while he’s at work making excuses just to see her. Nothing has happened between us but I feel so bad anyway.