I got into a relationship and it's wierd

So me(19m) got into a relationship with my coworker (23f) just a few months ago. Things were very vanilla for some time. we really liked talking to each other and loved spending time with each other, we had sex but it was pretty normal. Until 2 weeks ago when she said she was gonna do foreplay where she would dominate me but without asking me drugged me and tied me up, things got normal after a while but it took me a little while to understand what happened she said it was just how foreplay worked and i guess I agreed. She also doesn't like if I talk to any other or girl and is very controlling. My friends have adviced me to leave her as they said the drug incident was SA. But I'm very conflicted as I know that would be the right decision but she is very nice and sweet outside of these things and also like really gorgeous. What should I do?