24 M in a toxic relationship with 23F which I'm unable to breakup

I am 24M in a toxic relationship we were in love for about 3 years but in june 23 I found out that she 23F cheated on me with her colleague I am trying to get out of this relationship for past 2 years but i couldn't she threatens if I break this she would call her relatives and come to my home and make a mess which i cannot take she takes that as an advantage now am really stressed now she forces me to marry her b4 march 25 saying we were close and we had sex before(before june 23) there is no option for me to say no kindly give me an advice but I cannot handle if she comes to my home to threaten