Sims follow mine everywhere and walk into her home uninvited?

Recently, I have noticed that any sim that my sim gets close to, follows her everywhere. She got involved with a guy romantically and now he comes over constantly, asking her to become his girlfriend or proposing to her. I've had her turn him down but it doesn't stop him. He'll go inside her house like he was invited. He shows up when she's out with other sims, and even showed up at someone else's house she was visiting and walked right in. She made friends with this other girl and now she shows up everywhere she is and walks right in. It's been a while since I played the game. Did they add stalkers to the game or something? 😏 Is there any way to prevent this like a mod maybe?