“Stalking victims can be targeted at least 100 times before they raise the alarm, a police expert has said.
Wiltshire's deputy chief constable Paul Mills, said academic studies indicate the delay is down to individual acts by a stalker seeming unimportant.
https://www.bbc.co.uk/news/uk-england-wiltshire-47838538
“Profile of a stalker
Stalking is a crime of power and control. Stalkers tend to obsess about their victim. They may make many plans for the future that involve their victim.
Stalkers tend to have very weak social skills, and see nothing wrong with their behaviour.
Few stalkers see how their actions are hurting others, and they do not believe society’s rules apply to them.
They don’t believe they are threatening, intimidating, or even stalking someone.
Most stalkers see their actions simply as attempts to get closer to their target, help them, or to gain their love
Stalkers often ‘research’ their victims via public records for information or manipulating the victims’ family and friends.
Stalkers often obtain information from the victim’s friends, their workplace and from the victim’s family.
Romantically obsessed stalkers refuse to believe the victim does not want a relationship with them.
Stalking can be a form of retaliation because of some perceived slight. Indeed, many sexual harassment victims report being stalked in retaliation for reporting their harassers.
A stalker may be so subtle that the victim may not even aware that it is happening.
It is not always just the initial victim who is stalked. A stalker may also harass family, friends and fellow workers.
http://www.protectionagainststalking.org/what-is-stalking-2/