Definitely, Maybe

Starring Ryan Reynolds, Isla Fisher, Rachael Weisz, Abigail Breslin and Elizabeth Banks, the movie is about the love life of a man.
The movie starts off with Maya meeting her father, Will, after a sex-ed class. She is inquisitive and persists in hearing about her divorcing parents' life. Will agrees, but changes names in the story and makes it like a mystery where Maya has to find out who her mother is.
Emily is Will's college sweetheart. Will needs to go to New York to fulfil his dream of becoming a politician. Emily sends a parcel to her friend Summer in the city. Will starts off small at the campaign office and slowly rises. He meets the copy girl at the office, April, out of work and becomes good friends with her. Meanwhile, he also opens the parcel and ends up reading Summer's diary, which contains some romantic encounters of Summer and Emily. He brings the package to Summer and meets her on and off lover, a famous writer Roth as well.
He decides to propose to Emily and April pretends to be his girlfriend so that he could practice, but ends up saying 'Definitely, Maybe' falling for the intensity of his proposition. They return to her flat. He finds multiple copies of Jane Eyre and hears about her father's fatal accident. They end up having a romantic brush, with Will rushing out regretting.
When Will proposes the next day, Emily blurts out her cheating encounter. Will is heartbroken but moves up the career ladder, over time. April travels the world and they become pen-pals. With Roth's encouragement, Will and Summer start dating, but break up when Summer ends up submitting a negative article about Will's boss.
Will becomes depressed and hates everything when Clinton is involved in the scandal and in a drunken rant asks April out and in anger blurts out that she should go to the rehab. After years, he finds out the copy of Jane Eyre that April has been looking for. When he goes to give it to her, he finds out she is dating and living with a boyfriend, and so leaves.
Will bumps into Summer at a coffee shop and she invites him to a party, where he ends up meeting his college sweetheart. Emily and Will get together again and she happens to be Maya's mother. Even though Maya figures out her mother, she realises Will is still in love with April, considering he changed both the other girls' names, but not April's. Maya encourages Will to pursue April.
Will finds April to tell her that he held on to the Jane Eyre book since that was the only thing he had of hers and the story ends with Will and Maya going to April's apartment and the lovers kissing.
An OK romantic story. It was taken differently and I expected April would have been the mother. Ryan Reynolds could have showed more emotion, but it was bearable.