My family takes my emotions for granted,my sister talks about my ex boyfriend (all knew: he slapped me).help ?

my ex boyfriend used to be abusive & ended up slapping me and used physical coercion to stop me from shouting for help... my sisters know about all this in detail....it's been 3 years now but i still feel bad about it and expect them to understand this because i have never brought up his name for casual discussion.i don't know y they are under the impression that they can talk about him whenever they feel like it...when i retaliated i was told i am a Psyche and i should have grown over it by now.