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But stalking seems to be increasing*, so much so that a new national helpline, Stalking Helpline, has been set up for those on the receiving end.
Who can explain it? Sometimes it's a romantic delusion, with the stalker seeing someone as so perfect, so unique, so special that they become obsessed with them. They also imagine that sooner or later the person will see the stalker as equally perfect and special and a wonderful relationship will result.
If onlt they send enough letters and gifts, and wait outside their heart-throb's home often enough, eventually all the attention will pay off.
Then again it may be all about power. The stalker's aim is to gain total control over the person's life and make them feel trapped and helpless. They want the victim to be aware of nothing but the stalker and what he (and it's usually he) will do next to disrupt their life. An extreme form of bullying in other words.
Some people still don't take it seriously. They say a woman should be flattered or amused by all the attention, or that the stalker is just some passionate admirer who's going too far. They fail to recognise the sheer distress and humiliation the victim is going through.
Yes, to begin with, the unwanted pestering is simply annoying and puzzling, but as it continues relentlessly day after day, sapping energy and making normal life impossible, it becomes a hideous nightmare.
One of the new helpline's founders is Tricia Bernal, whose 22 year old daughter Clare was shot dead by her ex-boyfriend after months of harassment and threats.
Flattering? Amusing? I don't think so.
* It is estimated that over a million women in the UK are victims of stalking every year.
See also: The Network for Surviving Stalking