Movie was from around 90s to early 2000s. The plot was about how couple was cheating on each other, and one of them had camera and was taking a lot of photos during the movie. Firstly, guy cheats on her gf, afterwards girl cheats on him with his friend in their flat. And in the end girl run away to some country or alaska(remember there was a lot of snow).
Closer (2004) with Jude law, natalie portman, and julia roberts