Help remembering a movie?

[Marlene D]

I need help remembering a movie all i remember is that its definitely not an old movies it was made in the 2000s andit was a women who was widowed at a young age and i think she was either married or it was her fiance who died and then she and his best friend and friends go to what was going to be their house ...and she falls in love with his best friend, even though she always wondered why her husband(or husband to be) was friends with him....and she also finds out he had a son (meaning he cheated her)