I didn't want to date my current girlfriend how do I leave 19M 20F
Hello I'm sure the title sounds super bad but please let me share my story and sorry for any grammar mistakes.
For some context I met my current girlfriend around a year ago online yes I know online anyways our interactions were limited cause she wasn't on the game very much at the time but over the course of said year I had made a good group of friends and eventually fast forward I had talked and gotten to know her more and she eventually joined the group. We had started talking about our interests and hobbies and watching some shows I never really made any suggestive comments or hints toward anything during the course of our friendship. There was already another girl I liked but I never told anyone in the group because she was also a part of the group and I didn't want to start any drama so I never mentioned it fast forward a couple months (my current girlfriend) asked me out after we're on a call for a while watching a show and I didn't know what to say and said something along the lines of "I don't really know what to say can I have some time to think about it I don't know how I feel this is kinda out of no where ".
She ended just bawling and crying and telling me how she fucked up and how I was the one person who actually showed her kindness and treated her like a human being because in her previous relationship her ex basically just used her for sex. After telling her what I felt she hung up and I was left sitting debating what to do I was scared cause she has a past of self h**m and also has bpd and I was aware of what she was capable of doing so I ended up calling her after talking with some of my friends about who told me I should accept her confession even though I didn't have feelings, So I called her up and knew by her tone she had done it again so I ended up saying yes out of concern not out of pity.
For some other context this is all over online by the way but she has all my socials and some of my families we know what each other look like and irl names yes so I'm scared that if I do attempt to end things her friends will be sent after me in anger or something bad will happen to her I do truly love her as a friend just not romantically, I feel miserable I don't want to continue to do this or mislead her but anytime I try and make any hint I'm not interested she'll push more and more and it's getting harder and harder to handle she's made it clear that if I were to leave that she would commit you know what pretty much because she couldn't handle that reality.
My personality does NOT match hers at all we have little to nothing in common besides a few interests I mentioned in the beginning and I would like my partner to be my best friend but with her it isn't like that at all I don't know what to do and it's taken a toll on me mentally.
How do I leave without causing any harm if possible please help?
I can also answer any questions if needed.