Ha ha ha! You've got to love love-triangle movies...I know I do! This movie sounds a little like that "Indecent Proposal" movie. I love when movies delve into the darker areas of life!
You know I haven't seen a lot of really excellent "new" movies lately...personally I think Hollywood has taken a turn for the worse in recent years, but have you ever seen "The Butterfly Effect"?
Wow! You know I wouldn't go so far as to say it was a classic or anything like that, but that movie made me feel like the way you do...sort of like I couldn't actually believe what I was seeing, and I couldn't believe how things were turning out! It was definitely cool...I'd recommend it to you if you haven't seen it. It is a little creepy, though.