Along Came Polly (2004) {forum request}

http://www.imdb.com/title/tt0343135/

Reuben Feffer thinks he's found the love of his life but on his honeymoon he discovers her cheating on him with a scuba instructor. Reuben travels back home to get his life on track. On a night out with best pal, Sandy Lyle, Reuben discovers an old school friend, Polly Prince. Reuben feels a connection straight away, and tries constantly to get her to like her. But it's not going to be easy for Reuben, especially when he spends his days calculating risks, and when someone unexpected turns up.

http://www.youtube.com/watch?v=-CnRUC6KK60