Secret Smile

Secret Smile is a 2005 British drama producted by ITV. It was broadcast in two parts and was based on the book of the same name by Nicci French. The show stars Kate Ashfield (notable for her role in Shaun of the Dead) as Miranda, a young architect who, on a whim, decides to take a strange man home with her from the skating rink. They quickly form a relationship, but Miranda begins to get nervous as Brendan (played by a very creepy pre-Doctor Who David Tennant) becomes increasingly possessive. She breaks off the relationship after discovering he has been prowling through her things, including her teenage diary. However, she seems unable to be rid of the man, as he manages to worm his way into every aspect of her life, using her family and friends as a means of getting to her. As the Other Wiki puts it, this "leads to a passionate web of lies, deception and death."

This show provides examples of:
 * Affably Evil: Brendan seems to be the perfect gentleman to everybody but Miranda. That is, until the bodies start piling up...
 * Cassandra Truth
 * Crazy Jealous Guy
 * Hey, It's That Guy!
 * Idiot Ball: It gets passed around the table during the course of the show. Miranda gets to hold it most of the time, but the other characters also get their turn. It's never adequately explained  despite Miranda's warnings.
 * Love Makes You Evil
 * Manipulative Bastard: Brendan is the textbook definition.
 * Police Are Useless: At least from Miranda's point of view. She is appalled by the fact that the police do nothing about Brendan, despite all the evidence against him.
 * Rape as Drama
 * Sibling Rivalry
 * Stalker with a Crush
 * Too Dumb to Live: Your Mileage May Vary, but there are many times when Miranda makes downright stupid decisions. Like going to Brendan's house after receiving the phone call, despite many, many warnings that it will be a trap. Cleverly averted.
 * Twist Ending