Help me find this mystery/thriller movie.

I watched this movie maybe 8 years ago. There were a young family, wife and husband and they moved to a new house on the hill. They had some strange neighbour, but he was living not so close to them. So the husband started to cheat or he didnt appear that often in the household and the wife was scared in the evenings. I think he was working in the city. Later on some car was pasing by in the evening and she was getting crazy with everyday more and more. In the end I think she killed her husband.So all of the things was just a dream and she killed him in the begining and she was sleeping with his dead body. (the last was what i remember, i am not sure of it) Thank you guys!

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