It's overall a story of a dude mourning his dad, who is gay, as well as his mom and their marriage. And on top of that, his own love story, his history and all that. The dude is Ewan Mcgregor and the girl is Melanie Laurent, who puts the whole world on her face as an actress. See also "Inglourious Basterds"-- she's incredible.
So it's my favourite movie when I'm sick or sad or lonely or tired or writing the bar exam tomorrow. I highly recommend it for anyone who likes brunch, horses, ballet or that Russian kind of sadness.