There could be various reasons for this, and I can only speculate based on general possibilities.
Some common reasons why an ex might show up unannounced could include:
Closure or unresolved feelings: Your ex might want to talk to you about the breakup, seek closure, or address unresolved emotions.
Nostalgia: Visiting a familiar place can evoke memories and nostalgia, and your house might hold sentimental value for them.
Trying to rekindle the relationship: They could be hoping to reconnect with you and potentially get back together.
Need for support or assistance: There might be a practical reason for their visit, such as needing help or support for something.
Accidental visit: It's also possible that the visit was unintentional or coincidental.
Manipulation or control: In some cases, an ex might show up unannounced to exert control or manipulate emotions.
Regardless of the reason, if you are uncomfortable with your ex showing up unannounced, it's essential to set boundaries and communicate your feelings clearly. It's also a good idea to prioritize your safety and well-being. If the situation becomes concerning or threatening, consider seeking support from friends, family, or professionals.