AITA for Ending My Relationship and Asking My Girlfriend to Move Out After She Lied About Where She Was?

I’m 33 years old.

When I was 24, I received an inheritance that allowed me to purchase a condominium in downtown Vancouver, just a short walk from where I work.

My girlfriend, Stephanie (28), and I have been together for three years, and she has lived with me for nearly two years.

Because I own the condo outright, I’ve never charged her rent. I also earn significantly more than she does, so I cover nearly all of our household expenses as well.

About a month ago, on a Saturday morning, Stephanie told me she was going to a family dinner.

Her parents live about an hour away, and over the course of our relationship, I’ve attended dozens of family gatherings with them.

This time, however, I wasn’t invited.

She explained that the family was meeting to discuss concerns about her grandmother, who had recently begun showing signs of dementia. She also mentioned that her brother and aunt would be traveling in for the meeting.

She asked to borrow my car, and I agreed.

Later that evening, around 10:00 p.m., she sent me a message saying she had shared a few glasses of wine with her mother and had decided to stay overnight.

The following morning, around 10:00 a.m., she still hadn’t returned home.

She wasn’t answering my calls or responding to my messages.

Concerned, I called her mother.

That’s when I learned there had never been a family dinner.

Around noon, someone buzzed my apartment from the building entrance.

It was Stephanie.

As soon as she walked in, she told me she had lost her keys.

Those keys included the building access fob, the key to my condo, and the key to my car.

She also admitted she had no idea where my car was.

Eventually, I learned what had actually happened.

Instead of visiting her family, she had gone clubbing with a friend.

While they were out, they met three men and eventually went back to one of their homes.

Stephanie admitted she had been drinking and allowed one of the men to drive my car.

After arriving, the vehicle was left parked illegally at a bus stop in downtown Vancouver and was later towed.

She insisted she hadn't personally parked the vehicle and therefore didn't believe she had done anything wrong.

She also claimed she hadn't become intimate with any of the men and had only accompanied her friend to make sure she stayed safe.

What bothered me even more was that she didn't know the man's name, had no way to contact him, and had no idea where my keys were.

She also admitted she had lied about visiting her family because she believed I wouldn't approve of her going clubbing.

At that point, I decided to end the relationship and asked her to move out.

Her family believes I overreacted.

Additional Information

Yes, ending the relationship and asking her to move out happened at the same time.
I fully understand why many people question whether the events happened exactly as described.
I recovered my vehicle shortly afterward after contacting the police, who directed me to the towing company.
The police confirmed the situation would not be treated as vehicle theft because I had voluntarily allowed her to use the car.
The building deactivated the missing access fob, replaced the lock to my condo, and I'm currently paying to have the vehicle re-keyed because the original keys remain missing.
Stephanie immediately paid the towing charges and has agreed to reimburse me for the parking ticket and the cost of replacing the vehicle keys.
As far as either of us knows, she and her friend had never met those men before, and they have no reliable way of contacting them to recover the missing keys.

AITA for deciding that the lies, the missing keys, and the misuse of my car were enough to end the relationship?

Trust, financial responsibility, property ownership, vehicle security, and honest communication are important foundations of long-term relationships. When major decisions involve shared assets, personal safety, and accountability, clear communication and mutual respect can play a significant role in maintaining healthy relationships and avoiding costly legal or financial disputes.