The character engages in stalking.
Stalking is a term commonly used to refer to unwanted, obsessive attention by individuals (and sometimes groups of people) to others.
Stalking can be defined as the willful and repeated following, watching, and / or harassing of another person. Most of the time, the purpose of stalking is to attempt to force a relationship with someone who is unwilling or otherwise unavailable. Unlike other crimes, which usually involve one act, stalking is a series of actions that occur over a period of time. Although stalking is illegal, the actions that contribute to stalking are legal, such as gathering information, calling someone on the phone, sending gifts, emailing or instant messaging. Such actions by themselves are not usually abusive, but can become abusive when frequently repeated over time.