Hello,
Sir you can not get rid of this mental harassment without getting rid of the relationship, if you want to continue the relationship and you just want this harassment part to get over, it is advised that you consult some elderly member of the family who can make you understand the things and then can try to solve the issue. There is no legal solution to the fact that she is causing mental harassment.
The above advise has been provided in light of the limited facts posted by you, Let me know if I can be of any further help.
Regards