Me (20F) found out my partner of 4 months (22F) is embarrassed of me, and talks bad about me to her friends.

Hello, this is my first time on here and hopefully my last, but recently ive found out my girlfriend of 4 months has been talking bad about me to her friends, and I dont know what to do.

For reference, im a very colourful person, im loud, bubbly and I admit a bit ditzy at times, but I do think I am a genuine and nice person.

I came over to her place after a long exhausting day of work, and on my way back I had been soaked by rain because I had forgotten my coat, but despite the overall bad day, I tried to plaster a smile on my face as I came over to my girlfriends place. I knock a few times before she opens the door, she looks amazing as always, and she pulled me inside and got me a towel. She asked me about my day and I was didn't want to off load my bad day on her so I said it was fine, I gave her a kiss on the cheek before heading for a hot shower.

I had my shower, and I dried off and changed into one of her shirts I had taken in with me, then I headed out of the bathroom and back to the living room where she was nowhere to be found, I called out to her and she said she was getting changed. Im like ok, so I sit down and watch a bit of tv, but almost immediately I find a gameshow, and on it is a question, and a think about me is im a very curious person, and I wanted to fact check the answer to the question, but I had broken my phone the month earlier because I had gotten scared by someone knocking on the door and I threw my phone in shock and the screen smashed. So anyway, I knew my girlfriends password, and her phone was on the table, so I unlocked it and went to Google to search up the question.

As im doing so, a message pops up.

"Is she over at your place?"

Now, i wasn't suspicious, but my curiosity was peaked, so, I PROMISE, with no foul intentions, I tapped on the message, and I was taken to a group chat, and obviously I saw the message that id tapped on, but above it, I saw messages mentioning me, so I scrolled up and what I saw made me cry.

There were countless messages of my girlfriend degrading me to her friends, bringing up ebaressing things id done, and habits I have, that hurt a bit, but as i kept scrolling, I saw a massive chunk message shed sent, detailing the story of how I found out I was a lesbian. Now for reference, the way I found out I was lesbian was extremely messy, and it had an impact on me throughout my teenage years to the point of having to move schools, it was a deeply personal story I didn't tell many people, but i had told her, and she had wrote it up and sent it in the group chat, going as far as to make little comments about how I must have been "overplaying it", and that fucking hurt. Her friends were encouraging her, goading her on, clearly feeding on the drama.

But by this time I had broken into sobs and tears, and my girlfriend hearing the commotion, rushed out, her nails half painted, because i guess she wanted to paint them after getting changed and stuff. But so she saw me, she looked genuinely concerned.

But then she saw i had her phone. And her face dropped. Concern lingered, but she face had gone pale, she rushed over and snatched her phone away, berating me for taking her phone, stopping herself like she knew she was wrong and apologise profusely, but also trying to make herself feel less guilty, but she did care.

We got into an aurgement kinda, i dont know what you'd call it, I cried a lot and she tried to make it up to me. I ended up leaving and left to my best friends place. Shes been messaging me non stop for the past few days and ive ignored her, but she says shes super sorry and she was peer pressured a little but she was also a bitch to me and shes sorry.

My best friend insists I break up wirh her, "im too pure of a person for her", but I'm so unsure, I think i love this girl, but she revealed things deeply personal about me to random people I dont know.

So please, please, please tell me Do i break up with her?