Stalkerware is a term given to apps that let someone spy on your smartphone activity. They’re also called “spouseware” because they tend to be used by abusers to spy on their partners.
Most of this software ends up on a device through one of two ways: A phishing attack (email or text links that contain viruses and trick you into clicking on them by pretending to be something/someone else), or physical access to the device.
The article is a good read with tips for people in abused relationships.
Check It Out: How to Find Stalkerware Apps on Your Phone