UK acts, the right to keep your life personal

Hey so i was wondering in the UK, what acts are there that state you have the right to keep your life personal? I was first of all thinking the data protection act of 1998 but its not really data so can some of you guys help me out.

I want to know what act would state that i have the right not to say what i do in my personal life... its just my ex girlfriend is spreading stuff about me and i just want to know what acts there are that will stop her from saying stuff about me, its just shes making up all sorts of stuff which i do in my spare time, which doesnt happen, im sorry if this doesnt make sense but all i really want to know if there is an act of the uk parliament that gives me the right to keep my life personal

Just to add, What i do in my personal life isn't illegal or anything i just want what i do to be personal