My girlfriend and I moved in together while working. Shortly after, she “pranked” me by lying—saying her ex hugged and kissed her, and that she might go back to him if our relationship didn’t work, just for attention.
She only came clean after 8 months, and all the overthinking, stress, and hurt I went through during that time were real. She says it was her mistake and promises she’ll be “perfect.”
Even after this, she still expected me to give an answer about when we should get married.
I realized this was a serious breach of trust, and I broke up with her. I’m feeling hurt, frustrated, and honestly conflicted about how someone could think a prank like that is okay. The worst part? Now I doubt everything she’s ever said. I can’t trust her, and it’s hard to even process what was real or fake in our relationship.

Has anyone dealt with something similar? Was I right to end it, or should I have tried to work through it?
Update: Hey everyone, thank you again for all the support and responses on my post.
Background:
After the first incident , where my girlfriend lied about her ex hugging and kissing her, only to later admit it was “just for attention”. I spent months overthinking and constantly doubting everything. I tried to explain that my questions and insecurities were because of her actions and the broken trust. But every time I tried to talk about it, she turned it around on me, saying I was “taking away her peace” and “making her suffer,” instead of offering reassurance or accountability.
Before that lie came out, she had already pulled another “prank.” She told me her male best friend had told his parents that he liked her, since they were pressuring him to get married. I was exhausted from work that day and reacted badly only for her to later admit within an hour, it was just a joke, saying, “Don’t worry, not a big deal, I’m a prankster.”
Looking back, I realize this hasn’t been a one-time issue. There’s a pattern of emotional games, dishonesty, and deflection. But i still stayed through all of that just because of love and now i just feel nothing. Just blank.