Controlling The Relationship
Controlling behavior is surely a sign of an abusive relationship. Controlling behavior is when one partner believes they are of higher "power" in the relationship and think that they can control their partner.
Some abusive partners will constantly check up on the victim because they do not trust them. They might time the victim after they leave the house, check the odometer on the car, and question the victim about what they were doing and where they go.
Invading Personal Information
The abuser can look on the victim's digital devices. They can look on email, website history, and the call history on their phone.
The abuser can take control of finances, try to tell the victim how they think that they should dress, who they can talk to, and where they can go.